Patriarchy is mainly used as just a combination of anything feminists hate, but it was supposed to be a real thing. It's supposed to be the values of a traditional European society where power is concentrated in the hands of a few men. Now imagine going to some medieval Lord and telling him a youth has been threatening death upon ladies who won't give him nude etchings of themselves. Probably flogging is going to be his suggestion. The reality is that patriarchy, as far as it ever existed, is not diametrically opposed to feminism, but sometimes an ally and sometimes an enemy. Feminists make use of traditional patriarchal values when it serves their purposes.