These media outlets exist to make money by selling advertising, not to "tell us the truth". They write the stories that they believe will get people to buy their papers, listen to their radio shows, and watch their TV networks. The difference is that some of them just make stuff up, like FOX and Rush Limbaugh, because they know their audiences don't really care about honesty or accuracy, as they're just tuning in to have their ignorance and bigotry ratified. While other outlets like the N.Y. Times do care about honesty and accuracy, but only to the extent of telling the story they choose to tell. Not to the extent of selecting the stories that they choose to tell.
Nearly every story of "liberals enforcing political correctness" that I've ever seen or heard of have come from the right-wingnut media, and were either completely untrue, or were so skewed and hyperbolized as to be blatantly deceitful. But because the media knows their audience wants to believe it, and already does believe it, and they will tune in to have those biased beliefs ratified by these dishonest and hyperbolized stories, they keep churning them out. And the right-wing nuts keep seeing-and-believing that they reflect reality.
Such dishonesty has become a way of life, in America, in American media, in American politics, and in many of the American people. And it's all about the money.
It's always all about the money, in America.