Most Helpful Guy
You do have the option to encourage certain behavior. Manipulative? I suppose. But it is your perogative.
That said, all of us are a little immature. You just have to hide your love of lego and pretend swordfighting at some age. Curses.
Most Helpful Girl
Since you didn't provide much info im going to generalize. Id tell him he needs to tone it down a knotch but reassure him as well. Let him know there's a time and a place and that enough is eniugh sometimes