Edward Winkleman's aside:
My personal take on political correctness is that it's an artificial construct that has benefits in the short run, but will outlast its usefulness and eventually become harmful. What I mean by that is shaming people into considering others' feelings (or at least keep their hurtful opinions silent) long enough for those others to gain some power socially is a good thing, but for everyone to truly be on an equal playing field, that pseudo-politeness eventually has to end. It's foolish to think you'll ever get everyone to like/accept each other. The only practical thing you can hope for is that people have equal opportunity and equal protection under the law and that with those protections they can fairly fend for themselves.