OMG, there are soo many.
-bad breath
-a "close-talker" remember that Seinfeld episode? People who invade your personal space when talking to you?
-people who have to touch you constantly
-people who avoid eye contact
-people who interrupt and try to "over-talk" you
-attention whores
-ignorant people
-inconsiderate people
-people with no sense of humor
-insecure people
-gay-for-pay models who are actually homophobic
I'm sure there are more, and the list grows the older I get. But these are my biggest ones.