That would be true if those ideals were applied in alignment with liberal values. However, the most common material form of DEI is rooted in postmodernism and its various offshoot theories (queer theory, critical race theory, intersectionality, post-colonial theory, etc) in which colourblindness is inherently racist.
I don't think you do know what it is, and I don't think being queer inherently imbues you with that knowledge.
Queer Theory is a philosophy (or theoretical framework) about language (as with all postmodernist philosophy). It's not a "study", and while queer people can be a subject, it's not its primary object.
Furthermore, a book written by two liberal scholars is not a "far right nonsense book".
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Why do people insist on taking hard positions on topics despite never having read the material?
> while the DEI types waltzed right in with shitty grades
And you know that because you checked everyone's grades?
I'll also note, you didn't say your "white son" had good grades himself.
Given that "local state school" almost as a rule let most people in, I doubt your "white son"'s good grades. And besides, grades aren't what matters. SAT or ACT scores are what matters.