I don't like close-talkers. A good two feet or so is acceptable.

People who I do not have a moderately close friendship with who touch me is weird. Sometimes my boss will pat my shoulder for a second after thanking me or showing appreciation for something. He does this with everyone, I've seen him do it. It isn't a creepy or hitting on kind of weird, it's something he does. Touching someone who you are not personally friendly with in anything other than a handshake is considered an intimate gesture reserved for people who are more-than-people-you-work-with and people who are more-than-acquaintances, so it throws me off when people break that barrier.