This is complete bullshit. We've sequenced neanderthal DNA and can tell exactly how much modern people have in common.
If you want to promote some scientifically-accurate racism, the only "pure-blooded" homo sapiens come from central and southern Africa, everyone else is just a little bit neanderthal.
Right? Arthur Clarke has a story in which our long lost cousins finally come to rescue us from the shipwreck millennia ago, and offer also to correct the genetic mutation that reduces skin pigment...
If you want to promote some scientifically-accurate racism, the only "pure-blooded" homo sapiens come from central and southern Africa, everyone else is just a little bit neanderthal.