Guess what — one can move to a different neighborhood. Or, at least when buying a condo, one can read the HOA board meeting minutes. If they come across as petty, don’t buy there.
I wonder if there’s any legal way to make a neighbor so terrified of you that he’ll sign anything just to get you to be happy. Maybe get some NRA stickers for your car and invite him to the local rifle range to go skeet shooting?