> Claiming that blacks are a different species, not even a different race, is some next level Hitler / KKK / etc. shit.

I may be missing something, but the claim I've read around the Internet is that "Africans" are the only pure Human group, and are a different species from Neanderthals, while other Human groups have a small percentage of Neanderthal genes.

Whether that's true or not, it seems like a far less problematic claim than the one you mention.