Ignoring the fact that oppression can come from outside of congress (university policies, for example), those people are defining patriarchy to simply mean "Oppressive policies written by people with penises, even if feminists support those policies".You are of course entitled to your opinion, but I think you'd be better served by engaging with a more nuanced and complex version of these views. What you describe here is caricature. And in all I think it says more about you than feminism.
A common refrain in feminist circles is that patriarchy hurts everyone. A good example is parental leave as it applies to men. Paternity leave in the US is absurdly bad, suggesting that we as a society do not value the time a father spends with his child. Along those lines, men are typically graded on a patronizingly terrible curve when it comes to childcare. And so on.
Note that these aren't just laws, but societal norms, especially the latter where people praise you for doing basic shit like picking up your kids from work or whatever. If you view patriarchy as an emergent property, then the idea that "laws written by men" are a sufficient description of the concept is just absurd. You could of course take the least coherent out of any group which espouses a belief and engage with that, but that's not an honest way to have a discussion.
So like I said maybe don't engage with the most ridiculous possible presentation of feminism.