garyt1957 much ado about nothing
Actually, there is tons of research in psychology into the ingrained neural pathways that evolved to allow both conscious and unconscious guilt-free harming of those perceived as lesser/other through various means of dehumanization and inferioritization (as well as "otherness") mechanisms.
Or you can just look at the fact that your daughter or granddaughter or wife earns 77% as much as her male counterpart in the same job with the same performance metrics.