It’s funny how PC changes over the years. I have a female friend in her early eighties who won’t call black people “black”. In her day that was like calling a black person a nigger, so she uses “coloured” instead as that was the PC word when she was young. I agree that there are many cases where PC has gone too far, in some cases absurdly so, but that doesn’t make the fundamental principles of PC invalid (which I think was OC's point). As with most things there are always going to be dick heads who will go to extremes, and in the PC cases it’s likely because they want to show-off how liberal and fair minded they are.
In a similar vein, I despise the way you cannot criticise Israel without being accused of being anti-Semitic, or say that you can’t stand Louie Spence without being accused of being homophobic, or say you can’t stand the Indian caste culture without being accused of being racist.