[Someone of her upbringing doesn't groan out loud. But. Bringing a hand to her temple and looking away from him, briefly, because. you stubborn jerk.]
Do you make it your personal goal to be as obtuse as possible? [Her tone isn't joking, more resigned, but this kind of reply, coming from her, pretty much confirms he's somewhat successful in the tension dissolving. Jerk, why does she put up with you.]