That's all. If you think, under those circumstances, that the boy ought to be given the back of your hand and told to shut up, you're welcome to write your own fanfiction where that's what Professor McGonagall does. The further consequences seem predictable enough. The thing is, in my story, Professor McGonagall can see that too.

It does sound like a request to make McGonagall behave in an obviously irrational manner. McGonagall would have to be seriously thick if she didn't adapt her interaction style when engaging with Harry.