Political correctness or incorrectness is not unique to progressive or left of center movements. There is a right wing version of political correctness, that is more often known as "message discipline." Right wing people are much more effective at "staying on message," probably because of their authoritarian tendencies. Right wing media obviously have a very strict editorial policy of never missing an opportunity to use "Democrat" as an adjective or "illegal" as a noun. The right wing rank and file seem to absorb this through osmosis, probably because they stay tuned to one channel. Right wing people also don't air their family laundry in public, or debate what is or isn't correct "message discipline" in ideologically mixed company. This helps them avoid the appearance of someone in their movement pushing a style guide on them, and makes their message discipline appear spontaneous. In practice, I think the mechanics of it is more "monkey see, monkey do."