You should introduce yourself - not kidding.There's an emplacement just above me on the mountain, a well known about town 'prepper' with more conspiracy theories than late night on the internet...
He's also well armed, to the point of being scarily armed. The day he caught on I was flying a drone above the place was occasion to fire off a clip.
These days I fly up the canyon a hundred yards or so before gaining any altitude if I know he's around. I doubt he's foolish enough to actually shoot up into the air, but the staccato tone of his shooting was a clear enough message.
If he's a prepper tell him you're practicing in case SHTF and you need to scout the terrain.
Preppers mostly aren't crazy - they just take comfort in being prepared for the worst. Hey, there's worse hobbies than that.
Anyway - just let him know you aren't spying on him and put a face to the buzz he hears. After all - the government has been using drones to spy on pot farmers and militia encampments for years.