Congrats! Earlier this week I saw "Hidden Figures." It was great to see women STEM whizzes portrayed in such a positive light. I have a library hold on it since I am dying to see what kind of liberties Hollywood took.
My DH has a friend who may be of similar mind as your boyfriend's band mate. Lucky for me, we are in the same physical vicinity only once or twice a year. My DH removed the guy from his news feed and it made his life a whole lot less stressful.
If a person is completely set in his ways and is not interested in listening, learning, and possibly changing, sometimes ignorance (on our part) can be bliss. I would just as soon not know the extent of a person's misogyny, racism, homophobia, ageism, ableism, etc. if I just have to see them socially on an infrequent basis. Of course, if they have a say in policy, practices, and harming the people I love, that's another basis.