The thing is, Cav is a gobby Scouser.
Cavendish is merely a gobby tantrum-thrower with a face like a spoilt toddler.
He's not a Scouser, he's from the Isle of Man.
He's not gobby either, he's actually quite quietly spoken, really nice guy.
He's young, extremely talented and could perhaps do with a bit of media training but the thing is that every time he's interviewed it's right after a stage – you've just ridden 100+ miles through dust/mud/hail/sun/wind, survived crashes, got the team organised into a lead out train and put absolutely everything into the last 300m – immediately afterwards dozens of journos are sticking a microphone into your face and asking daft questions. Can hardly blame him for a few out-of-place comments every once in a while.
The same media that was fawning over him during the Tour is now saying he's a flash-in-the-pan/one trick wonder etc, of course he's going to get wound up. Bit of a misjudgement expressing himself the way he did but I've seen worse tantrums from far less talented riders…