'Oh, I'm sure you're right.'

His brain is already constructing ways to change that. As well as some more outright distractions for Harry to put up with. The man's not worth even the minimal effort it would take, but it might be mildly diverting for a time. He gives Harry a derisive look over, then deliberately turns his back as rudely as possible.

'Bye.'

It's a shame he didn't lose it enough to hit him, but there's always next time.