according to @Custoslibera’s post
Not a single person on the left has ever said math is raciat. That was something Tucker Carlson wholesale made up after we started asking why black kids did worse in school. As for "black lives matter" I'd say that's pretty self-evident, and the only possible rebuttal ("don't white lives matter too?") has a one sentence counter ("obviously. but white lives aren't under threat right now.")
More to the point, respectability politics in general is a trap. We could have better slogans, that's true, especially in the "getting people on our side" phase, but compromising what we believe in to be more palatable to moderates, even in the slightest, is unacceptable. "Sure, I'm cool with trans people (maybe I'm even trans myself), but neopronouns are where I draw the line" is their in. Once conservatives see that we admit some point is too far to our side, once they see the bubble of people we protect can shrink, they won't stop until it's shrunk all the way.