-Guidos, particularly those of the false variety. (I go to school in New York, OK? I have to deal with more of them than I'd like, i.e. more than zero.)
-Jingoistic patriots. (No, I will NOT get out of "Amurricah" just because I won't be attending your Tea Party rally. Now stop yelling at me before I lodge that megaphone down your esophagus.)
-Religious extremists of any variety (this includes atheism, which is every bit as religious as theistic belief systems.)
-Relentless optimists. Actually, most optimists. (Yes, maybe it really will get better if I just put a big smile on my face. Or maybe people will think I'm mildly deranged, you obnoxiously cheerful fuckwit.)
-People who dismiss entire genres of music based on their mainstream representation. (Listen to me carefully: Not ALL black metal is Satanic. Not ALL hip-hop is about hoes and money. Not ALL screamo is sung by prepubescent males wearing too much eyeliner...oh, actually, wait.)
-People who take their inherent advantages in life for granted, and especially those who DARE whine because they don't have it even easier. (No parenthetical humor this time, I'm completely serious about this one. Note tat I'm not saying we all need to be spouting that "compared to kids in rural Africa..." stuff all the time, just that we should be aware of the privileged state that many of us enjoy. Awareness does not equal guilt.)
-Narrow-minded people. (As an example: I'm an anarchist, but unlike most supposed teenage "anarchists," I actually have a solid grounding in political and specifically anarchic theory. Despite that, though, all it takes for a lot of folks is to hear me say "anarchist" and they either a) get weirded out or b) assume I'm just your average teenage pseudo-rebel. Leaves very little room for any kind of substantive political debate.)
-Military recruiters. (Look, how many times do I have to tell you that I'm a pacifist before you'll actually believe me?)
And so on in a similar vein.