The bottom line is the kid got himself in position to ask for an autograph. Lawrence was already there and he stiffed the kid.
I don't care if he single handedly built a children's hospital and a Make-A-Wish amusement park the next day.
He stiffed the kid.
He did stiff the kid and he was a short sided fool to have done it not to mention hos complete insensitivity to the feelings of the kid.
If it were me I would have been more than happy to sign an autograph for a fan of a rival.