What do you do if your friend annoys you- all the time?

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HELP..I have a friend who is really annoying. We are not really that close but we talk everyday- we're classmates. And I'm quite used to the way he speaks... he's really frank and he's got a girl's mouth [tactless]. But there are sometimes- many times that he just intentionally hurts my feelings... He calls me plastic, insensitive, irresponsible, O.A. [over reacting], all the evil adjectives [and he really means it]- I don't even know why... He's the one who is insensitive, and it's not just me, he does that to other people too. I think he's got a mental problem or something..[kidding] Well, I just don't know the problem, sometimes I think it's better if we just don't talk anymore, so we won't fight... So, what do you think?