It has nothing to do with math, full stop. Yet, math teachers are required to waste their time learning it.

One could consider it a waste of time if it were demonstrated not to be effective improving the outcomes of learing math.

Math teachers need to know (1) math; and (2) how to teach it.

The argumet is that this falls into the second category.

I am not claiming to have read any evidence that it is effective, or even that there is any. I do think this shallow dismissal is improper.

So the burden of proof is on those who doubt that indoctrinating math teachers with critical race theory improves the teaching of math?

That sounds a bit unfair, especially considering that anyone who would seriously try to provide such evidence would probably commit a career suicide, by being called a racist and cancelled.