Mao’s Red Guard was made up of “social justice warriors” too.
The “PC gestapo” is in full effect on college campuses today.
Political correctness is not about civility. It is not about being polite. (People who don’t know better will argue that PC is about being polite, and so will people who absolutely do know better. The former are just ignorant. The latter devious.) It is about control. It is about speech control and thought control.