I don't care for arguing, but for those that do, learn about rules of debate and such. Ad hominem (attacking the person) attacks are the weakest form of arguing. There are many other fallacious arguments that I see in face to face conversations, and on internet forums. But, ad hominem attacks are really lame.

Google it, jeez.

Example:

A: Prove to me you exist.

B: You're stupid.

A: uh...

B: No, I mean, completely inexorably, intolerably, undeniably, ignorantly, willfully stupid.