Political correctness is in the eye of the beholder. There's right-wing PC and left-wing PC, green PC and libertarian PC, and probably 20 different varieties. Nobody likes to admit they've got sacred cows and blind spots, some of which, sometimes, don't make a lick of sense.
Easy to see the shortcomings of someone else's version of PC, not so easy to strap on a set - to borrow a phrase - grow up, get self-critical, and see the limits of one's own.