I have seen it happen to preteens first hand. Children that a year ago were comfortable hanging out, are no longer so.
CRT encourages kids to engage in paint-swatch racialism.
It is heartbreaking to see first hand children who used to just be able to play together, worry about whether they should include or exclude other kids because of what they look like.
Teaching children to pre-judge people because of where their pigmentation is on a paint swatch is grotesque and it is child abuse.
If your ideology leads you to hurt children, then your ideology must be wrong.
So, pre-judging people is wrong because it erases their identity by making unfounded and unfair presumptions about who they are because of arbitrary physical characteristics that they can not control. Racial pre-judgement is a dangerous bronze-age heuristic that society should try to be moving past, but CRT encourages it.
Implanting racial self hatred (and racial pride) is a pernicious and dangerous thing to do, and if you can't see that I don't have time to educate you. Reducing human beings down to being "black and brown bodies" is disgusting. The correct response to that kind of dehumanization can only be disgust. And again, people in positions of authority imposing that in CHILDREN. At least adults have more agency to push back.
I don't care if that isn't "real" CRT. It doesn't matter if what I am talking about isn't textually correct. If the CRT you are talking about only exists in the minds of obscure scholars and texts, then it is just a fantasy, and doesn't really exist. The only real CRT is what is actually being implemented in classrooms across the country.