The real problem is not so politically correct terms but their issues. Because certain sides of issues are more popular, some people view them as correct. Sorry but just because a view is popular does not make it right. A big example is the antisemitic views that were popular in most of Europe prior to WWII. You could look at the Nazi party as the politically correct movement for it's time as they backed ideas that would be considered politically correct, especially in Germanic society.
http://www.debate.org/forums/politics/topic/82073/ It causes people, including those in power, to sensor them selves and others, to avoid sounding racist or sexist. In Rotherham for example authorities allowed Pakistani gangs to abuse 1400 girls because they didn't want to be called racist. Some people don;t see what a problem it is but they can educate them selves by reading my forum.
You have the right to say anything you want, but people also have the right to insult whatever comes out of your mouth (and you have the right to insult theirs).... As long as they don't use violence/force to shut you up. The problem with those who oppose PC is because they often forget that they aren't just fighting PC itself, they are fighting the censorship that comes with it... And instead of fighting censorship, they are taking one form of censorship (PC- censorship of the majority) and replacing it with another (Political Incorrectness- censorship of the minority). Because of this, I am completely neutral on the problem of political correctness.