And this is why we can't have nice things.
By your account, you took a hostile stance with the police officer. For what purpose? To prove that you knew more about FAA rules and regulations? The man was just trying to do his job.
When people take the attitude that they have a constitutional right to fly anywhere, we end up with laws completely ban their usage. Legally speaking, drone flying is new ground. Laws are still being worked out. When the laws are written, privacy, trespassing, and public safety will count for more than the FAA's ownership of the air. Right now, we do not have a clear and consistent definition of what that is.
When people take the attitude that only the FAA can say where their drone can be flown, that just forces governments to legislate more control over the sky to local authorities. That's why in the US we are facing the
Drone Federalism Act of 2017, Senate bill 1272. Education and working with people will accomplish more than "I will not kowtow to ignorant and macho law enforcement".