bite the hand that feeds (you)
To scorn or poorly treat those on whom you depend or derive benefit. You might not agree with your parents' rules, but be careful about biting the hand that feeds you, because you owe everything you have to them. In politics, if you bite the hand that feeds, benefactors can very quickly crush your political future. Yeah, I wouldn't bite the hand that feeds you. The women in the admin office may be chatty, but they are the key to getting anything done around here.
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