That's horrible, brother. According to my gun-savvy friends, discharging a firearm within city limits is against the law. I'm in N.M. Not sure about where you live.
In July of last year was taking some photos of a construction project for the construction company. I was flying an automated POI flight, while snapping photos manually (this process is now fully automated, but wasn't back then). I had just finished when this guy and he wife roll up in a pickup truck. He says, "What you're doing is illegal. And if I see that drone over my house again, I'm going to shoot it down." I explained to him why I was there, that my flight was perfectly legal, and that I had zero interest in his property. I offered to show him my flight path log file, which showed that my bird barely nicked the corner of his property, but also showed the bird facing AWAY from his property. I also offered to show him the photos I had taken to assure him I wasn't photographing his house. His typical knee-jerk response, "I don't care. If I see it over my property again, I'm shooting it down." I said, "Okay." I whipped out my cell phone, called 911, and called for a unit to come out. The guy took off. Once the cop arrived, I told him what I was doing and what the other guy had said. The cop said, "You're not doing anything illegal here." I gave him the make and model of the truck. And, unfortunately, apparently my GF had copied the license plate number incorrectly. The cop offered to stick around while I finished up, but unfortunately it had started raining. I asked him, "If I come back tomorrow, can I call a unit out to make sure I don't get any trouble." He asked, "For how long?" I said, "30 minutes." He said, "No problem."
Unfortunately (or fortunately, depending on one's perspective), the photos I had taken that day were good enough to create a point cloud, so I didn't have to go back.
I guess the point of all this is that some people are idiots and are just going to want to shoot our drones down regardless of how nice or in-the-right we are. The other point worth mentioning, is the FAA kind of shot themselves in the foot by making us register our drones. Because now our drones are entitled to all the same protections as full scale aviation. So this isn't a matter of simply "shooting down a toy." This is a matter of shooting down an FAA-registered vehicle, which should be a BIG F***ING DEAL.
So, yeah...talk to FSDO. Don't let this ******* get away with:
1) Shooting down an FAA-registered vehicle
2) Discharging a firearm within city limits
CLEARLY, discharging a firearm into the air is 1000x more dangerous than your drone will ever be.
Good luck!