The Quakers were the first to work on anti-racism, prior to the American Revolution.
For scientific anti-racism, 1836 is when the cranial studies were disproven.
Fear of anti-racism in academia stems from notions from this area: https://en.wikipedia.org/wiki/White_genocide_conspiracy_theory although it is usually filtered from that intensity into “I will mock it because I don’t understand”, which is mostly benign except when deliberately repeated ad-nauseum, then it’s a socially acceptable personality disorder exhibited in poorly made Netflix comedies all with the same name: Triggered and making 25 year old jokes about PC-am-I-Rite? lol
PS: nobody is replacing anybody. Relax.