She breaks out upon him with, "Charlie, what a noise you make! Don't you know better than to slam the doer in that way when you come in?
If you can't learn to make less noise in going in and out, I shall not let you go in and out at all." Charlie knows very well that this is an empty threat.

Still, the utterance of it, and the scolding that accompanies it, irritate him a little, and the only possible good effect that can be expected to result from it is to make him try, the next time he comes in, to see how small an abatement of the noise he usually makes will do, as a kind of make-believe obedience to his mother's command.

He might, indeed, honestly answer his mother's angry question by saying that he does _not_ know better than to make such a noise.

He does not know why the noise of the door should be disagreeable to his mother.

It is not disagreeable to _him_.