Girls on their mobile phones during a conversation with me while we're out or at a restaurant = dump.

Stupid
Too serious/uptight/lack of sense of humor (like people who don't think dead babies are funny ..pssh)
Extreme arrogance. I don't mind a little cockiness here and there, but some people are just ridiculous.
Closed-mindedness/just plain ignorant
People who are too shy. Even though that's how I am, I need someone who will counteract my social retardedness or else it's just really boring.
People who don't have minds of their own/fence-sitters
Hunters/people who get off to hurting animals (or people, for that matter)
People who think porn/sex is disgusting or a disgrace to mankind

Things like that.

surely that would go without saying...

You never know, I bet a lot of Sonic Youth fans have a lot of strange fetishes. I know I do.