So much this. The 2 neighbours over my back fence are assholes. They never helped pay for the fence when it first went in, and I didn't even bother to try and get them to help with the recent repairs... just paid for it. The neighbours beside me are fantastic. I had my fencing guys fix a small problem with the neighbour beside me, and I refused his offer to pay... so now he cuts my front grass as a thank you.
Your bad neighbor talk reminds me of an incident with my neighbor that happened within the last week. I was reeling afterwards. No property damage. Just walked in on utter chaos with the husband using a pig whip to beat their dog in the face. I backed out of there so fast and was practically stuttering as I went "Nooooope. No. No no no no. No." By the way, don't ignore red flags or think you can moderate behavior around you. Learned my lesson. Oh, and also, "Why does he do that?" Is now on my kid's required reading list around age 13. If you have children, girls especially, put this title in their hands. There are free PDFs online available.