A ten year old acting like that seems completely normal to you?
On topic, I also saw Iron Man 2 recently. Pretty forgettable piece in my opinion. Villain was boring, the romance seemed superficial, and the subplot of Stark inventing a new element based on a model of a town his father made 40 years ago really was too much to swallow. Still, the action was pretty good and Robbert Downey Jr. is always fun to watch. Overall pretty good, but doesn't hold a candle to the first movie.