Smoking (tobacco or otherwise) or drinking any more than casually (especially if they talk about it all the time). I hate alcohol.
Cologne, as it masks a person's natural scent (which may well be 'compatible' with my nose) and too many people use way too much, which hurts my head.
Immaturity/can't take anything seriously. This pisses me off, because if I'm joking, I'm joking, but if I'm not, one of my biggest pet peeves is when people don't even try to take me seriously.
Rudeness goes along the same lines, and arrogance can go along with it.
Gossiping and stirring up drama is stupid, and I have no need for those who do either. I don't see many men like this, though, so I guess it's not so relevant here.
Total bull-headedness. Everyone's stubborn on some level. It's human. But when someone is just so unyielding as to not even listen or understand about anything, making compromise impossible, then there's no point in being around them.
Being outwardly opinionated to the point of obnoxiousness. I really don't care about politics at all, and religions are interesting things to discuss but not if it's someone shoving something down your throat instead of a civil, intelligent conversation. It can be anything else, too, not just politics and religion, especially if it's something I don't care to have an opinion on, like celebrities.
Speaking of intelligent conversations, if someone can't hold one, then I have no reason to talk to them. Use the brains that you were given, please.