As you will see, plenty of non-ironic uses of the term 'Politically Correct' with a heavy sprinkling of Mao. https://www.google.com/search?q=%22politically+correct%22&lr=lang_en&biw=979&bih=641&source=lnt&tbs=lr%3Alang_1en%2Ccdr%3A1%2Ccd_min%3A1%2F1%2F1960%2Ccd_max%3A12%2F31%2F1980&tbm=bks …
@jaspergregory cf. the WP editor heavily lobbying for the removal of the Cultural Marxism article, who self-described as CM months before.
. Banned in Sweden. SubGenius, Zhuangist, white-hat troll. Defrocked mathematician. Brain problems.