When your audience is comprised of high school dropouts... angry at their status in life and totally ignorant of history... their soft skulls are a sponge for this type of mumbo-jumbo.
An acquaitance has a black, educated Afro-Centrist BIL. He is quite successful in Midwestern academia and married to an independently wealthy Caucasian. Even though the woman I knew was very far left and full of liberal guilt, she snickered when discussing her sister and BIL.
All this idiocy is apparently embedded in the PC elite and is passed on to clueless students of all colors within the university. So, while the skulls-full-of-mush part is probably correct, the part about drop outs and anger over low status is not necessarily so. I believe that the lack of true historical knowledge is and was purposeful, perpetrated just so students of all sorts could be more easily inculcated into various forms of whatever-centric lies. The anger, IMO, comes from the disconnect between what they have been taught is truth not meshing with what they see/experience in reality. It is the outcome of severe cognitive dissonance. This anger and confusion feeds all the other conspiracy theories.