Histerik, you and l are both guilty of that sort of comment.
Btw it is possible to make a stupid comment saying that you are right. You have just basically said that agreeing with you means the commenter is smart. Not necessarily.
@cerebellum: Any comment saying I am right is very interesting & definitely not stupid. There is nothing wrong with self referential comments - we owe our proof of existence to Descartes "Cogito ergo sum".