I'd suggest that it would be a very good idea to start having someone
there with you with a video camera.....both for your protection and
also, it is amazing how many loud bullies back off when they are being
recorded.

I once was in a series of confrontations....with a really nasty guy.
When I started recording the meetings, he first tried to bluster and
stop us recording, but when we told him that every time we met, we were
going to record it and show others......he suddenly stopped coming around.

Wayne Howell
Photon Phlats Observatory
Port Townsend, WA