Thing is, IQ matters to the arrogant arses that you might want to trump. So for a normal person, the response to "hey, I have 150 IQ, I'm right damnit" is "Oh my god, I can't believe he just said that. Or thinks it matters." But to the person with the 150 IQ who's sure he's right because of it, it may be somewhat more effective to say "Yeah, I have 170, can we talk about something else now?"
Yeah, this is the context I mean, though more so on IQ scores themselves, rather than "I'm right because my IQ is x". In some wannabe-intellectual circles, the "My IQ is.." dicksize contest does come up, and it's fun being able to quietly speak up and shut them all up.
lol. to 'trump' with the score on an IQ test... i think i'd laugh so hard i'd shit my pants if someone says "hey, i have 150 IQ, i'm right dammit"