Well, he does have o suffer a consequence. He learns his mother doesn't practice what she preaches.
Panel 1: RevisedElly reminds him that he has to be polite to people and he always has to watch what he says.
Panel 2: She then says not to blurt out the first thing that comes into his head. He needs to think and then speak so as to not hurt people's feelings.
Panel 3: MikeClone demonstrates the same poor listening skills as Regular Mike by asking if he can have a pen-knife. RevisedElly, who is giving NeoLizabeth a bath, says "At YOUR age?...."
Panel 4: "........Don't be stupid!!" This, of course, leaves him floored because he just remembered her earlier lecture.
Summary: MikeClone has just learned a valuable lesson: RevisedElly won't tolerate her own wretched behavior from anyone else around her.