You have hit the nail on the head.

I often say that in an earlier generation, we had a different name for politically correct — it was common politeness, the idea that you should treat people different from you with respect, even if you disagreed with them..

Now a whole group of people have decided that they don’t want even to be civil to many of their fellow citizens, and they had invented a new phrase to go along with their refusal to be civilized, because calling it “rudeness” just wouldn’t sell.