When they say something stupid you can say.
1. It's better to let someone think you are an Idiot than to open your mouth and prove it.
2.I don't know what makes you so stupid, but it really works.
3.Calling you an idiot would be an insult to all the stupid people.
4.Some babies were dropped on their heads but you were clearly thrown at a wall.
5.Stop trying to be a smart ass, you're just an ass.
6.Keep rolling your eyes, perhaps you'll find a brain back there.
7.Of course I talk like an idiot, how else would you understand me?
8.Keep talking, someday you'll say something intelligent!
9.Every time I'm next to you, I get a fierce desire to be alone.
10.I'd like to see things from your point of view but I don't believe it to be possible for me to get my head that far up my ass.