you are very weird. Ain't nuthin' INSTINCTIVE about it and NUTHIN' to do with color of the skin. INSTINCTS in humans areIt is not only a social norm. It is instinctive behavior. Evolving in the jungles of sub Saharan Africa has not prepared most Negroes with the characteristics necessary to thrive in civilized countries.
This was understood when Negroes were restricted to de facto second class citizenship.
the same world over. Social customs are a product of evolutionary pressures unrelated to height, shoe size, or migratory features of neural crest cells