[He's not sure how to take that one, so he frowns at her for a moment as he searches for clues in her face.

Though he's well used to dealing with nonsensical idiots, she doesn't fall quite into the usual mould, so extends her the benefit of the doubt and assumes she's socially awkward/naturally rude]

There's a war going on for the people in cavern too, but they've learnt how to switch off.

[He realises the hypocrisy of pointing that out while he's lurking as far away from their merriment as he can get. He huffs out a cynical breath of a laugh and looks away.]

You're not the only one who needs to learn from them.