I have a complicated relationship with political correctness. I don't think those who deride it want to be able to use it as an avenue for unfettered racism or bigotry. Personally I find PC language as a veneer of feel good bullshit designed to make people, usually above those or what it is they are describing to feel better about themselves.
Here is a small example. Saying a place is a slum instead of economically disadvantaged neighbourhood. Who are you protecting? Who is made to feel better? The severity of the problem is minimized. The situation seems controllable. Oh we just have to economically advantage it and it's singular problem will be solved. No, the place is a slum with the myriad of problems that word entails and we should be ashamed for its existence. Stop softening the issue.
Same could be said for using the term sex offender versus rapist. What would you rather hear to describe an actual rapist?
Clint's personal attitude is probably closer to that of his character in Gran Torino than anything else. A man who sees the world in good guys and bad guys and in clear right and wrong who doesn't like his world or personal rights infinged upon. He still sees the humanity in the other but wants and feels the need to push American values of strength and culture upon it.
That isn't what America is though by the book. That is just what a lot of it was in the past. There isn't anything that justifies racism or sexism and that is true whether PC culture exists or not. Don't forget it is called political because it is designed to sound as such with no concise leaning in one way or another, it serves as a veil.
The beauty of language and personal opinion still means that people can vocally disagree with you if you say something you shouldn't. Clint hasn't said anything racist to my knowledge. Remember that the man is an artist and artists in general hate walls placed infront of them that stops them from creating. Same thing is going on in stand up comedy.