That tone.

Well, he may not be entirely sure what all those words mean--at least in relation to each other; the words themselves he's all right with--but he certainly knows the tone. A sort of... exasperated superiority? Having to deal with people who are not worth one's time and yet take up more of it than they need to, because they can't manage even simple concepts? Something like that.

"Ooh, I feel like I just walked in on something interesting. Don't mind me."