And that's what patriarchy is, when put into full form and function across the intricacies of a society.
It is a social system that fosters a network of social castes based upon sex/gender and the intricacies thereof. It is regulated by beliefs and statutes surrounding embodiment and its many variations, sexual orientation, and gender expression.
Out of these factors a host of oppression bound rules, roles, and subcategories of humanity flow.