Jerks .-_.- like I always say.. don't criticize someones skills unless you're sure you can out-do them.
I myself annoy them by completely agreeing with them.
"You're a noob."
"Oh yes, I'm noobelicious!"
"You're weak!"
"I know! Its so sad.."
They eventually give up.

I keep my "Open Beta Tester" title on me, its kind of a "hey I'm not a noob" license.

I actually enjoy arguing.

-Goes and picks a fight with Chinh-