Not to mention other instances of political correctness that aren't usually called that even though it fits the original definition far better.

Saying ACAB or kneeling before the American flag will cause offense in many let alone something more inflammatory like "screw the troops". One could regard all of the above as wrong but that is the whole point - so do the current for the mainstream political correctness. Despite it literally being related to the state and thus far more politically correct and power linked than even the most tedious pedant about terms for minorities.