A simple solution: download the B4UFLY app from the FAA. If I get hassled, I usually do a return to home, and pull out my tablet, start the app and show them, that you have done your due diligence and have every right to be flying where you are. It's good practice to run it anytime you are flying a new area for your own protection. It starts with the FAA shield, it's very official and impressive to the layman. Then when they see your drone fly home by itself and land automatically it usually blows their mind. Also good to have your FAA registration card. Once they realize it's not just a toy (don't be afraid to tell them how much it cost you), they usually loosen up. If they do call the cops, just show the cops the app, your registration card and you are good to go.
B4UFLY link:
B4UFLY Mobile App
If you educate 1 person they may pass the story along to their friends. Try to be a good ambassador first. They also pass along stories of bad experiences they have had with drone users.
Another Great tool is FlightRadar24 for real-time flights in your area:
Introducing the All-New Flightradar24 Mobile App – Flightradar24 Blog