I kind of liked it. When a football player does that, it means losing is not something he is willing to accept and that frustration comes from wanting to win the game at all costs. That's a winner attitude right there. Sure it happens sometimes that said agression and desire to win manifests itself in the wrong way (Suarez best example), but at the end of the day I'd take a guy who does not accept failure, instead of one who's not that bothered when his team loses.
So, what he did was wrong, but his frustration was good, and, in the long run, that grit is the base of a winner mentality. He just needs to channel it to a good purpose. That's what I want from him basically, dig deep when he's on the field. Talent is there, and if he backs that up with effort and the right mentality, he's gonna be golden for us.