Pepper's jaw set in that moment that Tony left those words hanging in the air. She was about to open her mouth and verbally bitch slap Tony when he mentioned the paint balling. Well played, Tony Stark. Well played.
She decided to ignore the quip. Acknowledging it just encouraged him and she didn't want to do that. He had enough encouragement on his own. "Why don't you just get us another round of drinks?" she said.