Someone does?
Beside the fact that he was terrible even today, I did not like at all the reaction had in front of the fans. He's always been somehow arrogant without any reason. When he was loaned out in Parma, he talked shit about Del Piero and our club, thinking that he would have never returned. Thene, since his return, he's never been really consistent or useful in his performances, and instead of working humily to improve his game, he's always been polemic ("open your eyes", "I want to listen you" celebrations... He had a Facebook page that he had to close after he called some supporters "butthurt" after a goal in Coppa Italia vs Milan and was insulted... Today it looks like he said "pezzi di merda" to some supporters...). That's just ridiculous, Giovinco is in every way mean and arrogant, and very useless on the pitch for a team like us.
Personally, if I was at the stadium I would have jeered him too. But not because of the game, but because of his ridiculous behaviour and attitude, not once, not sometimes, but always throughout his career. And who's followed him closely knows that. That's the reason of jeering, fans doesn't jeer just because of a bad game. Padoin's never been jeered.