Robin DiAngelo explicitly said "Biologically, race isn't real. But socially, race is a very real set of socialized worldviews shaped by segregation and superficial anatomical features. The white experience of both the majority and systemically powerful is one which normalizes a rejection of the existence of our own bias and enables us to ignore the existence of radically different lived experiences."
A bias towards normalizing whiteness and being blissfully ignorant of the lived experience of others is being blamed, not genetics.