It is against the law in virtually any US municipality to discharge a firearm within the city limits, except in the case of LEGAL use of force...even "firing a warning shot" has landed people in jail and court...blasting an $1,800 drone in the airspace above one's home would probably fall into the "criminal" spectrum, and is probably a catch-all charge designed to encompass illegal discharge of a firearm, willful destruction of private property, menacing of the men who owned the drone and who showed up, and recklessly endangering the town/neighbors. As far as his claim that #8 birdshot is harmless...not so much when it rains down...there are over 500 pellets in each average 12-gauge low-base load of 8's...and he shot three times into the air--enough shot to blind some kid six to ten blocks away out playing, or somebody just walking along. Our Kentucky genius threatened people with being shot, while wearing an openly carried pistol...that is menacing. All in all, a series of criminal acts, each with legal penalties.
His next logical step: Getting out his scope-sighted .300 Win Magnum deer rifle and firing shots at a news helicopter...you know, because it was "hu'vrin!"