Tell her to fuck off

You turn around and start to leave, ready to do what she said. Then, an idea hits you. You turn back around to face her.

"Uh-uh," you say. "I don't think so."

"What do you mean you don't think so?!" she shouts. In some movies, you've seen, this sort of anger leads to an even-hotter interaction, but it will do the exact opposite this time.

"I mean you don't make the rules this time!" you shout back. "You call me, and ask me to come over. I do ask you ask, and come in. Now, you're going to make me do it again?! I don't think so!"

"But--", she starts.

"No!!" you tell her. "The only 'but' here is mine going out this door!"

With that, you exit, gathering your strength to slam the door behind you.