Considering how toxic PC people are to debates (ironically exactly because the gratuitus negativity they bring) that is more than a defence mechanism that any healthy community needs to develop to protect itself.
Political correctness should be considered the same as writing a negative comment.
You might get fewer downvotes if you define "PC" and offer some examples so we understand your perspective. Most people who rail against "being PC" are walking pits of gratuitous negativity, so people are probably assuming you're one of them.
Best example of my head: the developer on Node.js who got haunted to hell because he reversed a change from he to some gender-neutral term. For the feeling of some undefined person Node.js, and I suspect open source in general, lost a good developer.
Other example: after landing a satelite on a rock tens of thousands of miles away the lead of the rocket team is forced to make a tearful apology because is found to wear a shirt with semi-dress women and guns on it. Said shirt being made by his friend, who is a woman.
Other example: dongle gate, github metocracy.
So yeah, a few of these people may, sometimes, have a point, but the community will be much better of if we kick them out on sight.
This seems a bit different from my example: being attacked for using a less common term. In this case, the "PC police" (going by your examples) were the people attacking me because I used a term that offended them.
They attacked you because they assume, incorrectly, that you were one of the PC people, because you used a PC term, not just a less common term. This isn't unreasonable and the cost of letting PC people in is high.
Political correctness should be considered the same as writing a negative comment.