Political correctness hurts nobody and is a good thing. It's a shame that even some Democrats dislike it.
PC means "polite and cordial", a concept Republicans seem to have no concern for.
Problem with that, is "polite and cordial" was something associated with the upper classes going back forever in history. When you have a populist movement; they will see these rules as ways to keep them down. In short, PC culture = classist.
You can frame it in populist undertones. Tell people not to be douches. Its that easy.