It's true, but it seems like people work much harder (or are just so sensitive that they don't need to work hard at all) to be outraged at the suggestion of racism or sexism.
Or about just being an idiot. For all the people saying "PC!! PC!!!", there seems to be a similar amount of people saying "Not considering our FEELINGS is why _____ happened." The president of the United States wants a Safe Space, and to be treated like a Special Snowlfake immune to criticism. A large subsection of his voters seem to want the same. It's "PC" that keeps these people for being called out for the simple morons they are, imo.
Also, I do despise the overly "PC" mindset, that would criticise people for making a joke or a statement with no negative intent... but I would also say that there is a huge appetite for consuming that type of stuff. And by that I mean, there is basically a desire by a subset of conservatives to see the "PC boogeyman", and in the same way that a minority of extreme right wing racists might serve as ammunition for the "lib'ruls" to tar the other side, a minority of left wing extreme "PC" warriors do the same thing for others on the right, that want to ignore the other problems and focus on the small number that Twitt away about the inherent sexism of Xmas or about Microaggressions or whatever. The same group complaining about being tarred with the KKK or alt-right brush is often the same group claiming that the "real problem" is "the left" because of their PC agenda, not noticing that they are just focusing on the left's equivalent of the alt-right while complaining about the other side doing the same.