The police officer should have shot the jerk, however he was probably hesitant because he was concerned about the backlash and violence from the Black Lives Matter thugs.
If they're cool parrents they won't bother. I never really understood the 21 year age requirement for alchohol, like 3 years over 18 is gonna prevent kids from getting shit faced and climb a clocktower with a gun....
Unless you think its gonna turn really violent (like bodily harm violent), just mind your own business and move along. Or you could take the highground and intervene, which apropo is a verry good way to get shot or stabbed in the face.
Doughnuts are perfect energy storing foods, carbs and sugar for when you need to chase someone down for example. They're also really tasty, if a tad unhealthy, and when I say "a tad" I mean really unhealthy. Might I sugest carrying insulin shots on you at all times or just eat something else.
More than likely, they're not paying a bit of attention to you. If an officer has followed you that many times trying to find a reason to stop you, they would have stopped you by now. Most drivers can't drive more than a quarter mile without giving an officer probable cause to stop.
So...