I honestly think this is a cultural misunderstanding. He's probably not used to everyone being so completely uptight and overreacting to everything. He should understand that police here do not tolerate anything less than complete and instance compliance, they get extremely nervous and really bad things happen if you don't comply completely and immediately. Also he probably doesn't understand how nervous bar owners and managers are about being sued or worse for serving patrons that appear to be at all intoxicated. They can lose their business and even face criminal prosecution in America for that kind of thing. Everything is zero tolerance all of the time. I can see how a European would be a little confused.
Having said all of that, the cop was about to let him off with a warning. If he had put his phone away, he'd never have been arrested.