Actually, given his stature and platform, he is doing quite a bit by repeatedly stating his contentions with our current tax code, especially when it puts pressure on current lawmakers to do something they are eventually going to do anyway.
What you said may be true, but you weren't even in his line of discussion when you said it. That's why he's laughing. I can tell you the sky is blue when you say your car won't start because it has water in the gas tank.