A wonderful post for looking for reading suggestions!
I loathe the way "Politically Correct" is thrown around by anyone and everyone to apparently mean "someone wants me to push my boundaries and think about something in a different way and I don't want to do that so I'm going to use this phrase to make them the bad guys". I really encountered it as an undergrad, when we were pushing for diversity in the curriculum and working to get every class to include mentions of people who were not white Western male - essentially not the 7Ps, though that wasn't the terminology we were using. People who didn't like this idea claimed that anyone going along with it was being "politically correct". That made me angry in ways I still have problems articulating, though I've gotten better at that over the years.