We often see things in such a way as to better validate our own anecdotal experiences. I've known nerds who bully, and jocks who are nice. I've seen the opposite also. 
Also, I imagine we project the worst experience we've witneseed as a whole onto those things we dislike, and project the best experience as a whole onto those things we like. So I'd hazard that those who were beat up in high school by jocks project that experience onto all of them-- and carry that logical fallacy in their back-pocket, ready to whip out at a moment's notice. And those who are mocked and mentally bullied by nerds project that experience onto all of them, too.
As for me, I tend to take people on a person-by-person basis, regardless of their hobbies, their interests or what they drive. Seems to far work better than generalizing too...
But then again, what do I know? I'm certainly not clever enough to pretend every college football coach diddles little boys, that every jock has violent tendencies, or that every high school nerd will own an online money maker and retire by age twenty...
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