Why the Narcissist in Your Life Can't Help Bragging About It

By Matthew Sexton, LCSW, NATC

When researchers told people to make the best possible impression, most of what looks manipulative went quiet. One trait didn't. A 2026 study found that under a simulated "fake good" condition, psychopathy and sadism scores dropped significantly, while narcissism scores rose significantly (Collabra: Psychology, April 13, 2026). Machiavellianism barely moved. The bragging you've watched someone perform for a room full of people isn't a mask slipping. It's the strategy working exactly as intended.

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A 2026 Study Found Something People Get Backwards About "Faking It"

Researchers had 104 community adults in Serbia complete personality measures twice: once honestly, once while imagining a job-selection scenario where they had to make the best possible impression (Collabra: Psychology, April 13, 2026). Psychopathy and sadism scores fell significantly in the "fake good" condition. Narcissism scores rose significantly. Most people assume manipulative traits get better at hiding under social pressure. This study says one trait does the opposite. It comes out swinging.

The sample was small (87 women, 17 men, mean age around 27) and the design was within-subject, meaning each person served as their own comparison, with the order of the honest and "fake good" versions randomized (PsyPost, July 6, 2026). The study ran in April 2026 and used three established instruments, the Short Dark Tetrad, a bidimensional impression-management index, and a supernormality scale, to measure the shift.

Why would narcissism rise instead of hide? PsyPost's coverage of the research offered a plausible read: participants may perceive traits like self-confidence and assertiveness as professionally desirable, so instead of concealing them, they lean into them (PsyPost, July 6, 2026). Psychopathy and sadism don't have that same social cover. Bragging does.

Why the Bragging Isn't a Slip. It's the Strategy

Psychologists have a name for the self-promotion half of narcissism: admiration, one piece of the Narcissistic Admiration and Rivalry framework, describes assertive, charming self-promotion aimed at winning other people's regard (Grosz et al., 2021). Rivalry, the framework's other half, is the antagonistic, devaluing side that shows up when the self feels threatened rather than admired.

That distinction matters for anyone watching this play out in real time. The person working a room, holding court at dinner, or narrating their own accomplishments to a group is likely running admiration. The performance requires an audience, which is exactly what the "fake good" study found: narcissism rose specifically in the condition built around making an impression (Collabra: Psychology, April 13, 2026). The same person snapping at you in private, once the audience leaves, may be running something closer to rivalry. Same underlying pattern, two very different stages.

This is also where reality-testing becomes useful as a skill rather than a vague piece of advice. Reality-testing just means checking what you're observing against what's actually happening, instead of against the explanation the person is offering you in the moment.

Confidence or Something More? Where the Line Actually Sits

Grandiose narcissism, the bold, entitled, self-promoting kind, looks like a completely different animal from vulnerable narcissism, the defensive, easily-wounded kind, in most general-population research. But when researchers controlled for how extraverted or introverted someone naturally is, the correlation between the two jumped from close to zero to r = 0.53, evidence of a shared self-centeredness core underneath two very different presentations (Jauk et al., September 2017).

That's a useful thing to know if you've watched someone swing between commanding a room and collapsing into wounded defensiveness the moment they're questioned. It can look like two different people. The research suggests it's more often one core pattern wearing two outfits, and which outfit shows up often depends on whether the person feels admired or threatened in that moment.

None of this is a diagnosis, and it isn't meant to be one. Full narcissistic personality disorder affects an estimated 6.2% of US adults over a lifetime, based on a nationally representative sample of more than 34,000 people (Stinson et al., 2008). Most people who brag, dominate a conversation, or bristle at feedback don't come close to that clinical bar, and a parent, ex, or coworker's traits often sit somewhere on a spectrum rather than at a diagnosable extreme. This article isn't about labeling the person in your life. It's about learning to read the pattern you're actually watching.

How to Deal With Antagonistic People Without Losing Your Grip on Reality

The most useful reality-test to come out of this research is simple: does the behavior track with the audience? Since narcissistic self-promotion specifically rises under impression-management conditions, notice whether the grandiosity shows up mainly when other people are watching, and shifts or disappears once it's just the two of you. That single observation tells you more than trying to guess at someone's internal motives ever will.

A few concrete ways to apply that when you're dealing with antagonistic people:

• Name the behavior, not the person. "That was a boast aimed at the table" is something you can verify by watching. "He's a narcissist" is a label you can't actually confirm from where you're standing.
• Watch the pattern over time, not the single incident. One big story at a party proves nothing. The same self-promoting move repeating across many audiences, over months, is data.
• Notice who's in the room when the tone changes. If warmth appears with an audience and coldness appears without one, that's the admiration-versus-rivalry split showing up in real time, not a mood swing.
• Decide your response based on your actual relationship, not on winning the exchange. A coworker requires a different strategy than a parent, which requires a different strategy than a partner. Low-reactivity engagement works differently across each.
• Give yourself permission to just observe first. You don't owe anyone an immediate confrontation. Reality-testing is allowed to happen quietly, over weeks, before you decide anything.

If the behavior includes more overt tactics, like contempt, baiting, or twisting a conversation until you doubt your own memory of it, there are more specific ways to respond to that kind of pressure than the general framework above covers.

What If the Person Doing This Won't Change?

Grandiosity that gets rewarded by an audience has very little built-in incentive to change on its own, and that's a realistic expectation to walk in with. The research here doesn't suggest the behavior is fragile or accidental. It suggests it's working, at least from the person's own vantage point, which is exactly why waiting for a moment of self-recognition is often a long wait.

Your options narrow to what you can control: how much access the behavior gets to you, and how much weight you give the performance. If this is a coworker, there are ways to manage the relationship when quitting isn't realistic. If it's a family member and the pattern has been present for years, the decision gets harder and more personal, and it's worth working through with a professional rather than alone at 1am re-reading old text threads.

When Reality-Testing Isn't Enough

Reality-testing is a skill you can build on your own, and it genuinely helps. What it can't do is repair the exhaustion of years spent managing someone else's need for an audience, or untangle whether your own instincts have started to feel unreliable after enough exposure to someone who rewrites the story depending on who's listening. That's a different kind of work, and it's the kind therapy is actually built for.

If you've read this far because a specific person came to mind more than once, that's worth paying attention to. A conversation with a therapist can help you sort out what you're actually dealing with, separate from any label, and build a response that fits your specific situation rather than a general framework. If that's useful right now, book a call and we can talk through it.

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