excuse you william is twenty now he's not a teenager
which...doesn't make the room any less gross, ewww

William scowls at him a little. "Aye, well--" Well--yes. Fine. That may be a valid point. "I'm just saying."

It's not exactly a snappy retort, but whatever. William takes a big bite of his oatcake, demonstrably Not Concerned about the person Jim thinks he is right now.