Probably never. The idea of any person or ethnic group as being “inherently evil” seems to run counter to the basic ideas of Critical Race Theory. And the idea of teaching anything as sophisticated as actual CRT directly to elementary school students is as laughable as it would be for calculus or quantum mechanics.
It is not unlikely though that some teachers who have been influenced by CRT may have presented material which could be interpreted as saying that Caucasians are inherently evil.
A case in point is the book “Not my idea” (see also here for a polemically critical reading) that was criticized in a (subsequently deleted) post by C.S.Friedman and defended in a response from Tom Robinson.
It’s hard to imagine that Friedman had ever actually read the book. (She describes the story of a little girl’s frustration with her parents’ protection of her from evidence of society’s structural racism as being a tale of how “A white child encounters a red devil-figure who offers him a deal”.) But the page she refers to does occur, albeit in the supplementary material; and, although not in the story itself, the term “whiteness” is definitely introduced as a label for things that are evil.
Personally, I find this kind of linguistic overloading silly and dishonest at any level, but to ask an elementary school child not to identify “whiteness” with just the property of being white is worse than silly.
So, although I doubt that any teacher of CRT has ever actually affirmed that Caucasians are inherently evil, I am pretty sure from the evidence of this book that some teachers who think they are reflecting CRT have used language which a child might well interpret as saying Caucasians are inherently evil.