Both my DM and my MIL were brought up in deeply misogynistic environments, my mother in Catholic Ireland and my MIL as the daughter of a single mother in England. They both married men who hold blatantly sexist views. My father said when I was 12 that educating women is pointless as their place is in the home. He holds this view in spite of the fact that my mother is highly educated with a very responsible job and has been the breadwinner throughout their marriage while has barely worked at all. He still left almost all the domestic work and household organising to her and her life was far more difficult than it needed to be due to him.
FIL has similar views and is in general an insecure asshole who likes to big himself up at the expense of others.
Both women have the underlying belief that men are important, come first etc and have put up with treatment they shouldn't have due to this belief.
As an example when I moved in with dh