When conservatives use the term "political correctness", they're talking about their Sincerely Held Belief that they're being muzzled and not allowed (by who is never made quite clear) to express their true feelings. Or thoughts, should they come up. But feelings, definitely.

The way conservatives talk about political correctness, I'd swear they think there's an actual body of law somewhere, maybe in the USC, that specifies what they (alone, apparently) are not allowed to talk about or even think. Some kind of Liberal Sharia, I guess, enacted into law when nobody was looking, maybe one of those secret corners of the Patriot Act.

But other than hate crime laws, which deal with the consequences of speech, much like the traditional "inciting to riot" offense, there is no such thing as "political correctness", except in the minds of poor persecuted conservatives, and, as you detail, in the history books.

A consistent, almost ecstatically ritualistic expression of adoration among the Trumpetarians is "he speaks his mind!". There's a clear subtext that because Trump is a billionaire, he's above those imaginary laws that constrain the ordinary followers from speaking their minds. Put Trump in the White House to finally liberate the American id from its shackles of civilization!