The term "politically correct" has been used in so many different ways in different countries, time periods, contexts, that you really should define your terms more to discuss it.

Are you talking about politically correct as used by the American Left in the 70's and 80's, or by American Right in the 1990's, or by cognitive psychologists studying how language shapes behavior, or by.... well, see Wikipedia's description of how "political correctness" has been used by many different groups of people with different definitions.

http://en.wikipedia.org/wiki/Political_correctness