Why do men get sexist in bed?

From a little age my father has always been incessant on making sure my brother grows up as "a man". Buying him action men, leaning him towards sports and worse of all teaching to disrespect women. I don't agree with these gender roles being forced on him but he conformed to them and now is sports crazy and probably the most muscular guy in his year. But what upset most growing up was my fathers and brothers sexism that they would disguise as jokes and such. They would say things like women are only good for sex etc and now not only has my brother been slutshaming on facebook, posting images of girls and rude vulgar "ladish" comments about them, he disrespects his girlfriend completely. Unfortunately they are stay in the room next to mine and my dad lets them have sex in the house, which they do in early hours of the morning, he calls her the worse names a woman could possibly be called and degrades her completely to which for some reason she enjoys. People like to say oh it is just kept in the bedroom, but it isn't it leads to being degraded and treated badly outside of the bedroom, many men can't make that separation and find it hard to respect someone who they think is receptive to this sexist display as masculinity and superiority. I think more women need to stop letting this happen (or at least think about what it means) in the bedroom and demand respect and we could see more change in the real world as I don't think calling some one you're in a relationship with abusive names and slapping them is very healthy. I have had boyfriends try to spank, choke and name call me before during the act, and I put them right in their place, why did they think I was going to like being disrespected? I think the whole idea is the result of porn has had on young guys combined with this lad culture that encourages and rewards disrespecting women.

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