It seems that all of a sudden being "politically correct" has become a bad thing that must be prevented at all costs. The reason for this is evident for all who take the trouble to notice.
The anxiety and worry that stems from "political correctness" is that "political correctness" establishes a culture in which people who prey on others, who cause disruption through racism, sexism, hate mongering, sowing class or social divisiveness etc. are deemed inappropriate can themselves be castigated and ostracized. Political correctness creates a culture in which, if you have a distasteful idea or socially unworkable idea, you should keep it to yourself.
This anxiety and worry is rooted in the fact that humans do not resolve their differences and social norms in a purely rational fashion, but rely heavily on an emotional filtering of rational thoughts in order to preserve one's concept of oneself. This filtering may be more or less extreme in various circumstances, environments or contexts, even to the point of filtering out rational thought entirely. Consequently, humans have evolved to be particularly acutely tuned to the emotional states of others around them.
Consequently, it's not surprising that those with particularly odious ideas or "radical/extreme/deviant" ideas that they can't otherwise "sell" to their fellow humans will be loathe to see the development of such a culture. Being against "political correctness" means being fundamentally against the notion of strict social consensus, where one's bad ideas have equal footing with other's good ideas and where bad ideas can be still used to leverage selection against those who can be discriminated against for whatever reason in order to preserve perceptions of self-identity.