In the Old Stone Age era when Neanderthals lived groups were small and competed for resources directly – that is, if some hominids were hunting and gathering in some area and met another group of hominids doing the same they might attack them to chase them away from the limited source of food. read more
Maybe there is some ‘genetic memory’ of the persecution of Neanderthals by Homo Sapiens, leaving some white people (but not all) with an irrational fear/dislike of anyone with darker skin. White racism could be something less cultural and more primeval, more genetic, more subconscious. read more