"I am not running a school." That's a big Do Not Want. Also he's never been to one anyway. "Learning swordplay requires some degree of discipline and the ability to listen."

He's not convinced she has either one of those.

Especially considering the complete mess she's making and how she's already back to weird forms of address. Honestly he's judging her more for the mess. Imagine having to wash all that out of your hair.