Gotta break out that bell hooks:

The first act of violence that patriarchy demands of males is not violence toward women. Instead patriarchy demands of all males that they engage in acts of psychic self-mutilation, that they kill off the emotional parts of themselves. If an individual is not successful in emotionally crippling himself, he can count on patriarchal men to enact rituals of power that will assault his self-esteem.

For a lot of these dudes, the raw sexism is a natural outgrowth of internalizing patriarchy so hard that they start performing those rituals of power on themselves. In the same way that cops give themselves PTSD by training themselves to imagine would-be killers lurking around every corner for their every waking moment. The call is truly coming from inside the house.