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Definitely confront this guy about things in a nice but forceful manner, like, if x doesn't happen, then I'm going to do y. Let him know that he's being a total dick and you'd really appreciate it if he could respect your space by not leaving trash/dirty clothes/etc around the room. If he's only making his space a disaster and you can't stand his mess (which doesn't sound like the case), then ask for a room change (especially because you can say that your personalities don't mesh because his views are so radically different than your own). I know how shitty it is to live with awful roommates and the sooner you're out of your situation the better. I think if you just start reacting and messing with his stuff and bringing chicks home and keeping him up, it's just going to escalate, not help, the situation... and it makes you look bad to be bringing all kinds of different girls back and publicly hooking up with them, word gets out and then no smart girl is going to want to be another mark on your list of hook-ups.
Kill Him
that sucks