Is there an idiom for not "applying a double standard"?
I hope that if we find out his dad is the guilty one instead of her dad, he doesn't apply a double standard and does what he told her to do to herself.
This is too wordy, I am wondering if there's a good expression for this. I think "take up own advice" could be used, but sometimes there's no advice, and the person doesn't give an advice and says something harsh or worse.