If you buy a house in a district, you may or may not buy an insurance against neighbour's misbehaviour. But the first condition of the insurance is that you respect your neighbours yourself according some existing arrangements (specified in your insurance). Now if anyone is too loud when not appropriate, or drunk as hell, or peeing on your lawn, the insurance company will:
1. Pay you a compensation.
2. Make investigation.
3. Penalize the neighbour by raising his insurance fees (or via his insurer as they'd have some mutual agreements) or demanding a compensation from him. If he does not pay, his insurance is simply cancelled without cops and jails.
4. For ugly cases when neighbour is misbehaving too much (killing pets, breaking windows etc.), insurance company may have also agreements with water supplier's, wifi supplier's etc insurance companies that supplier cuts water/wifi/etc until the guy pays a compensation. Again, without cops, laws, police.
And if the guy goes to journalists and alternative insurer to whom he'll prove he wasn't that bad, just someone is exaggerating, then that insurer will make a good PR case and steal customers from abusive insurers. Or highlight the whole neighbourhood as a weird place to be or something.
The main point is, it's all done without guns and jails. This way every party has voice and can communicate their position any time they want to anyone. And insurers would have to strike a good balance between protecting customers and pissing them off. Like any non-monopoly business is doing already anywhere in the world.
So in one district it could be 100% okay to smoke and get drunk, while in another people would prefer less loud activities. The idea of a regional law just does allow this to happen.