You think they got sexism from a book??
I think they got it from their stupid lizard brains just like all the Christian misogynists and secular misogynists and Jewish misogynists and Hindu misogynists and Buddhist misogynists, etc, etc. I think this all started a long time before we had the capacity for complex language or self-realization. Your line of thinking can only lead to more prejudice and hate in the world, you should abandon it.