The police tells you to stop doing what you are doing, and all of a sudden you decide to do the opposite of what they tell you to do, you are initially breaking the law by disobeying a order, now I understand some people might get offended and pissed off because they think it's wrong, it now becomes a physical confrontation. Now I am not a punk bitch, but I know when to start and when to stop, especially since they are the ones carrying, a gun, a pepper spray, a baton, and OH my favorite, the STUN FUCKING GUN, and few other items I don't have in my pockets.
And if you feel that your right's were abused, then of course follow the proper protocol, contact a lawyer, file proper complaints with the police, and just do it the right way.