Believe me, my son is plenty excited when he scores, as are his teammates. And, as he is primarily a defender, it is not a very common experience. However, he does not like bringing a lot of attention to himself, and as a defender, he knows how infuriating it is to get scored on and have someone do an over the top celebration - especially when your team is being beaten handily. There is plenty of time for celebration after the game. I would never equate someone that smiles and simply gets back to the game to someone that overly celebrates, but perhaps that is just me.