"You have never pet a dog?" This is the most horrified Yelena has looked in this entire conversation, even though they have definitely both mentioned much, much sadder things. "I am so sorry, that is awful. You have to fix that."

The last bit is surprising as well, albeit differently. She has to put significant effort into not laughing, and only mostly manages it. It isn't malicious or mocking, just disbelieving. "All the time? If not for the honesty thing, I would accuse you of trying to flatter me."

But more seriously: "I don't understand why. I don't mean why I annoy you, I understand that, I am annoying even when I am not being an asshole and I was being an asshole the first two times we met, but I don't know why you would think about a single thing I said for more than five minutes after I left. Maybe eight, when I left the spoon behind. I really was not trying to rub anything in."