Comment by dekhn

I think your understanding is wrong although my experience with the term PC started in the early/mid 1980s and I don't know much about its use before that. What you're describing is more like "don't ask - don't tell" and "parental advisory" labels.

Typically, PC is associated with attempts to de-marginalize groups that are historically disadvantaged due to structural discrimination. To me the canonical PC is always spelling "women" as "womyn", to avoid using a term that contains the word "man", as a way to push back against perceived patriarchal naming/language systems.