I would also say that the problems with political correctness are as follows:
1) It forces you to speak not from your own experience, but from a “mutually” agreed upon image of races. I think this is repressing freedom. You speak from the outside in, society first, then you, rather than you first, then society. Those images may not even be correct, we may just be choking on simulacra.
2) For fear of saying the wrong thing, it keeps people away from the real struggles of real people. If we were to ask a polite gathering of liberals why ghetto black people stay poor and ghetto and black, if they didn’t actually know, they’d come up with bullshit, rather than admit that they don’t know. It penalizes ignorance and encourages speculation.