But that's not an example of political correctness, just conformity. People use the term "political correctness" in a variety of ways but usually it denotes something that can't be said for socio-political reasons.

Someone might say for example that “This isn’t politically correct, but most Immigrants are criminals and welfare abusers”. By adding the “not politically correct” disclaimer the person implies that whatever they’re saying is factually true but people wont admit to it for fear of offending people. The claim in this example is of course both offensive and demonstrably false. It’s factual inaccuracy is what makes it offensive. It’s a deviously effective strategy because not only do you tell your base a lie but you also galvanize that lie by portraying it as some secret truth. When someone says it’s not true your followers are preconditioned to dismiss their factual argument as “just being politically correct”.

None of the things that got people downvotes in "Nosedive" were of that nature everything was far more petty which I think was also intentional.