So your mother is in law enforcement and your reaction to police telling you not to lean on a car is to give back attitude, run away and yell at them? I'm not saying the police officers were right, but once again, just cooperate and avoid the hassle.
The officer asked him to stop leaning on a car? Why? Was he in the road or a dangerous position? Was he damaging the car the way he was leaning on it? Was there some decent reason to take notice of the kid? I'm guessing there's more to this but so far, we only have the kid's side of the story.