That is strange. When I do interviews, I will look if this is a nice person, if this is a professional person. I don't really think about which "group" they might belong to.

It seems not in this case, as this person hired a diverse team as measured by gender, race and sexual orientation. I'd venture there are multiple approaches to seeking interpersonal compatibility and some of those approaches tend to have better outcomes than others. It seems good to try to learn from people who practice those more successful approaches.