A guy with "perfect" hair and clothes. I like rugged "manly men" and men who are too into hair products and clothes kind of turn me off. There's nothing wrong with guys like these. But, I choose not to date them.
Also, guys who ramble on about subjects I don't really care about and who dismiss what I am saying so they can get to the next thought about their car, or their favorite band (in too much detail) or the intimacies of their job. UG.
A guy with no sense of humor.
A man who would be offended by a woman with a strong sex drive. That would kill it for me.
Also, guys who go on about their "buds" for hours. You are with me, leave your buds where you left them. An occasional funny story is one thing, but guys who go on about their "boys" like I know their friends and like them drive me crazy. Double if a guy goes on about his ex. I'll make an excuse to leave. Boy, you need to get over her or shut up about her before dating. NO woman wants to hear what a "Crazy" woman your ex was. Why are the Exes always "crazy?"