No one ever said that Pepper Potts was a mastermind. Case in point, this is her plan.

Step One: Make Tony jealous. This part is hard, because it means she has to pretend to like Happy. Worse yet, she has to pretend that she's interested in horror films.

Step Two: Insult him. This part isn't hard, because she does sort of mean it. She'd wanted romance and she'd gotten a farce of a date.

Step Three: His ego takes over and she gets what she wants.

He does not react the way she wants him to. He winces and leaves.