If I was to say youre a sissy beaver fucking goat sperm guzzler, and that you should die, and have many morey eels shoved up your stifining corpse, that would be flaming. Calling someone an idiot is just a little 'mean' (for lack of a better term), but is permitted as long is it doesnt get out of hand.
Also, he said "like an idiot". If I say you look like Timmothy McVeigh, does that make you Timmoty McVeigh? No. He meant you were mearly acting like one, or thats how I understood it.