Disregarding the Orwellian feel to PC speech, we need to understand it's basic structure and proper usage. Let me show you the way. PC classifications seem to take place to change the image of a group of people or a profession that may be suffering from some sort of bad reputation. While changing the name doesn't change the fact that they are air waitresses, or whores for that matter, it changes the perception. In a today's America, perception is reality.
Perception is the rule.
While you may be inclined to dislike PC and dismiss it, you are missing the point. Being Politically Correct has many great advantages. First of all, no matter what you say, you are saying it with the best possible intentions. You further insult by using the non-preferred term of Black people. You can easily be deemed a bigot here, regardless of your intentions.