Homophobic
Racist
"I can't get a date and it's all wimmenz fault! It has nothing to do with I'm a douchebag chauvinistic bastard with unrealistic standards. The wimmenz just don't like nice guys."

Trust issues - I have little patience when it comes to dealing with guys who have difficulties separating the actions of past girlfriends from current ones who haven't even done anything to deserve mistrust.
Smells - I have an abnormally strong sense of smell, so I can't deal with this.
Stealing jman's any kind of illegal drug use except pot.
Any sign that the guy is emotionally or physically abusive.
Touchy feely upon first meeting.