Thanks Gary. Interesting getting the "other" perspective on this. And I feel for you too. Having a bad neighbor is just not fun, especially if they aren't responsive.
Really appreciate your research and it does coincide with what we're finding. We're building a list of complaints (which are pretty substantial, from "racist comments" to a guest packing up in the driveway, to standing menancingly in front of the house without responding to a guest's "hello" or "can we help you", to frightened children and dogs). But it does seem like we'd need guests to support us in any court matter, and obviously they don't even want to come back to the house let alone go to court and face our nut-job neighbor again (which we totally understand).
We don't love the solution, but we've installed a bunch of cameras, and noise meters (Minut) to document if any of the issues he claims are happening are really happening (we're pretty sure they aren't), and capture any menacing behavior.
Now the guy has taken to putting up "Anti-STR" signs all over the neighborhood threatening to call police or impose non-existent fines and other mean stuff. We may be able to do something about that as it appears to be violating the association's CC&Rs.
For us, though, the head scratcher has been that this neighbor has been a great friend for years, and he even openly helped guests and took pride in being mentioned in many of our reviews. All that changed last year with no specific complaint from him, or any of our other neighbors. There is a lot of anti-Airbnb chatter on the mountain since the big snowstorm, and deserved or not, it seems to be spreading to a lot of locals. It's sad, because we employee a lot of local folks (cleaners, plumbers, handymen, gardeners, exterminators, spa cleaner) and our guests (who we screen religiously) bring a lot of money to a mountain resort they love to visit. I get that transient traffic can sometimes be a hassle for full-time residents (your situation included), but without anything specific to address, all we hear is "We just don't like outsiders (flatlanders)" as the reason for all the hostility.
Good luck with your situation!