I find political correctness is just a term people use to describe something they disagree with. What they actually mean is it is incorrect, but they can’t come up with the argument to support it, so they just term it politically correct. It is like fouls in football that are described as ‘technically correct’. In other words, I know it’s illegal, but all right thinking people (i.e. people who agree with me), wouldn’t actually give it even through its against the rules.
A useful thing for people who think stuff is too politically correct is to go back 50 years and consider where the world was at then in relation to similar type issues and what the people back then thought was politically correct or not. Or go back further.
But basically I think things are correct or incorrect, to label something politically correct is to disingenuously put a motive to something to further enhance your point that something is just incorrect.