I have a neighbor like that. It is very aggravating. Its especially bad because I tend to ruminate about wrongs and get stuck in negative feedback loops.

When things get really mad for my state of mind I try an exercise called "putting things into perspective" which helps me a lot. I make a list of situations that could be worse than having nightmare neighbors. I could be stuck in the middle of the desert without transportation and get bitten by a rattlesnake. I could be stuck in a burning building with no way out or worse yet I could be on fire myself. I could be in imprisioned and tortured. I could have end stage pancreatic cancer where pain meds don't work. Stuff like that.

I once had a nightmare neighbor and we had confrontations. Suddenly bad things started happened to my automobile:unexplained flat tires, broken brake line, smashed windshield. I called the police but they couldn't do anything.

I hope you find things that help you. My heart goes out to you.