Which is the exact opposite of doing it in person though, it's being all cute and funny about it. Actually doing that in person would look and feel radically different.
Compared to the stuff he types into his keyboard it's still lame, and being cute and funny in comparison.
Also, stupid is relative anyway. Who isn't stupid? Is Linus actually that stupid that he thinks he isn't stupid? And if he is, what kind of weight does he think this insult carries out of his mouth? Stuff gets tricky real quick like that.