Respecting the fact that she lives in her parents' house and therefore is subject to their rules is idiotic? Thank God such "idiocy" still exists. "You're not the boss of me" is what I'd consider truly idiotic and immature.
Although really I think the answer should have been somewhere in between, meaning her and her parents come to an understanding that although she lives there, she is still an adult and to a large extent should do what she feels is right etc. But if the parents disagree, she should either agree to their rules or move out.