Here's my $.02 from bits and pieces I have collected from forums and legal sites: Most important if you are accosted by some lunatic, the very last thing you want to do is anything that escalates what's happening. Here in New Mexico, that would result in a knife fight or gunfight with somebody going to jail and someone may be going to the morgue.. So say and do whatever is necessary to de-escalate. Next, unless it was an officer of the law, I'm not showing anything to anybody; no license, no ID, nothing. if the antagonist persist for more than 5 seconds and shows no evidence of going away, I would immediately call 911, tell the dispatcher that I am being assaulted and fear for my safety, describe the antagonist as to what he's wearing and what he looks like. That will inform the antagonist that when the cops get there, they will be looking for him and not ready for a discussion
if it is not a dangerous lunatic who is trying to question your right to do what you are doing, a few things to keep in mind: Notwithstanding any local ordinances concerning neighborhoods and zoning. the responsible authority is the FAA. Their property is classified as a "regulated commons". The property owner has a right to use the airspace above his property to build a house, erect an antenna, plant a tree, etc.. Any airspace that is not currently being used by the owner of the property is regulated by the FAA, from 50,000 feet down to the grass in his backyard; that is The National Airspace System. As far as privacy rights, everyone has a "reasonable expectation of privacy" in various places such as inside their home. They do not have a "reasonable expectation of privacy" in their backyard. They can put up a privacy fence, plant tall shrubs, etc., but unless they put a roof over it, you can operate an aircraft, manned or unmanned, at any altitude that the FAA allows. Of course reason should prevail. You can fly over that property with a 747, a Cessna, helicopter or a drone. Hovering over the property might be bumping into other laws such as harassment. Again, reason should prevail; as long as you're not dealing with a dangerous lunatic, it might be worthwhile to civilly educate the complainer. But like they say in the old country: You should endeavor to be right, but not dead right.