Sh** happens. In the days before cell phones (and drones) I'd often buzz my house at around 150 - 200 ft so my wife would know to come to the airport to pick me up. I know of a case where an Air Force pilot buzzed his home town in an F-16. Somebit** came flying down main street at less than 500 ft., pulled up over the top of the high school gym, lit the burner, and disappeared. I know of another case where a couple of guys brought a Cessna 150 down the main drag of their home town and, at one point, the wings were lower than the street lights. F-15s flying up the Med South of Portugal will often cruise along at less than 500 ft. I guess my point is: Drones are in their airspace as soon as they leave the ground, there is no right of way at that altitude. Chalk it up to experience and move along.