If Arya knew that she really hurt Scott's feelings, she'd feel terrible. Arya likes to put on a tough exterior, but deep down, she doesn't want to be mean, and she wants people to like her. But Arya doesn't know that, so she makes no move to apologize.

"You call children minors?" Because that must be what he means, right? From context? It's an odd thing to say. "I'm not just some child." Arya's been through too much for that.