[She's good at those leading questions, isn't she? As if insults to his intelligence are any likely to make him start talking. He already knows he's not particularly brilliant.

So he loads his proverbial brush with sarcasm and paints some broad strokes.]

Sure, let's go with that. I'm a dummy, moron, idiot - feel free to add to the list. Go on, really. You seem like you're on a roll.