@stewartk999,
I had a neighbor who verbally threatened me with a gun repeatedly. “I’ve got a gun and know how to use it.” “I’ll go get my gun.” “I’ll shoot anybody who does such and such.” Stuff like that. I guess he wasn’t so much a bully as he was just plain insane. I’d be in my home/business and there would be a knock on the door and he’d say something like that. I never did figure out what exactly was bothering him other than he apparently just didn’t like people. He was a door greeter at WalMart too. I’d run into him there from time to time and I’d make it a point to say hi. He never seemed to know who I was outside of the neighbor setting.
Anyway, I’d just pretend like I was too thick to understand that it was a threat and that everything was just fine. He’d get confused because I didn’t respond how he expected and eventually he just started avoiding me. When I went outside in my yard, he’d go inside. Then four years later I moved away.
Oh yeah, you can also make friends with members of violent biker gangs and invite them over periodically.