Honestly? I think you should have left it. There are enough people that already hate him that would've been all over him in a day or so that he would feel like a moron for posting it, the thread would disappear, and he would've learned from his mistake.
With your intervention tho, now he (rorio) learns nothing and will keep doing things the same (incorrect) way. I completely understand why he's pissed... I just think tha he is coping with it horridly.