People who talk bullshit. Not like the occasional exaggeration to enhance a story, but all-out, ridiculous, completely unbelievable lies, straight to your face. How do people get to that state, with that kind of notoriety and still think people believe what they say?
I have a friend who is that person all over. If he didn't tell lies and totally over do EVERYTHING he'd be a great guy but he needs to put on this act to be accepted. It doesn't wash with me and I now avoid the kid when possible.