The SARS Volta

This is a rough thing to come to terms with, whether you are the one who's not feeling it anymore, or the one that isn't getting felt.

I have a friend who is very into me. I drunkenly hooked up with him months ago, but I now regret it as I have gotten to know him even better as a person.
His (previously hidden) undesirable qualities was the thing to kill it:
he's racist, childish, insecure, currently refuses to go to school or get a job, is 100% financially dependent on his rich conservative parents who are eternally willing to dole it out to him, doesn't have many interests, hobbies or goals, and has standards that ascend his reach for categories other than females.
He has a good heart, but is largely ignorant. Highly critical of women's looks while he doesn't take great care of himself or his appearance. Most likely to conceal his many insecurities (he fishes for compliments). This is the type of guy who would call Cindy Crawford fugly for having a mole, while he is clearly not the picture of perfection that he expects in a mate.

This guy still thinks he can fuck me although I obviously haven't indulged that. I've learned my lesson--early impressions of people are not enough to go by, as people will intentionally conceal their negative character attributes. Is there any way to tell him I'm not attracted to him without causing a shitstorm? It's not like we are dating or ever were, but I don't want to do more than just get him to stop trying. We get along fine, but for obvious reasons it's never going to be more.

Similar experiences? This story is my equivalent to a seemingly nice girlfriend who can't get along with your friends or family and embarrasses you publicly.

edit/disclaimer: No, I'm not looking for perfection in a mate and I acknowledge my own flaws, but this is a scenario of shit gone unexpectedly wrong.

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(fiance)