The origins are pretty clear: https://en.wikipedia.org/wiki/Political_correctness

However lately, those on one side of the political spectrum in America have co-opted it to paint the other side as overly sensitive/weak etc. muddying it's original intent, often using "concern trolling" to rile up debate.

Examples: Sexual harassment, blackface

It's beige, got a Turbo button in front, and keyboard connector in the back. Wait...wrong decade?

I mean, it's been pretty much the same if you ignore all of the people going "LMAO IM AN ATTACK HELICOPTER" and the like whenever anyone even mentions a social issue