@Dustin_Shiozaki If I read your post correctly, you allow parties? You can rest assured that Airbnbs that advertise they allow parties will incur the wrath of the neighbors in a residential area. If you don’t care about their right to peaceful enjoyment of their neighborhood, why wouldn’t they object to your business there?
Of course no one should lie and say there was a shooting when there wasn’t, but is it possible that the behavior of your guests in general and the type of listing you rent out has driven them to this because you have shown that you don’t care? You say the neighbor has been harassing you for 2 years- Airbbs that don’t cause disruption, which get respectful, quiet guests, don’t usually cause neighbors to become upset.