The smile, if one was generous enough to call it that, vanishes. He's never been the paragon of patience and if she can't be appeased then there's no reason to humor her. He folds his arms across his chest and gives her an icy stare.

"Fortunately the PPDC doesn't pick pilots based on their smiles. I expect I'll get along with my partner by making an effort to meet them halfway, which is more than you seem willing to do."

He's careful to sound firm without sounding aggressive. There's no need to call attention to them and moreover, she's obviously trying to piss him off. If he gets worked up then she wins. That would be unacceptable.