Interesting
People tend to get too emotional upon words. I had a colleague from another country visit, and when he went into the store, he called someone in there a "negro", which should not be derogatory. But said person, took it in offense, all too readily. It is cultural biased or influenced
The term "political correct"(-ness / i.e. P.C.) is one used to alter or be constrained by a perceived orthodoxy. Such as the "New Left" and certain organizations or groups using it to defend their rights or ideas. Sometimes, being "Politically Correct" , or a person thereof, would seem as self-righteous.
There lies a paradox, when it is used to describe it pejoratively. In comparison when using it in a pedantic manner would make it to confine to the those ideas or freedoms of the "New Left" and those certain organizations or groups. However, this "confinement", itself cannot be politically correct if it restricts the "freedoms", of those who desire to voice their opposite views.