Maybe I'm just old and respectful and always try to put myself in other people's shoes, but... I wouldn't do anything too dramatic. And I probably wouldn't quit automatically. But it would allow me to be honest with my two supervisors and I'd try to explain to them why it is that that everyone hates working for them but pretends to like them, but in a super nice way, hoping it would actually affect a good change in them. I'd explain these points as well to their boss' boss (whom I'm pretty friendly with).