For example, if a neighbor calls in a kid's lemonade stand, I'm assuming that neighbor has had multiple issues with that family and can't make any headway, so shit just blows up. I'm not saying it's right, but I doubt someone just wakes up and says "HELL NO!" to an 8 year old's 3 hour project on the sidewalk.
Your chances of living next to one of those people are pretty low, but it's a big country, and there are a lot of busybodies just waiting to trounce someones fun.
Second, even when there is "backstory" a lot of it exists only in the mind of that neighbor. I met one of my neighbors when they came over to complain about "all the parties" at my house. The house had been vacant for the eight months I owned it, at least. (I was actually concerned people were using it, but there was no evidence to support it.)
That's exactly what happens, though. There are busybodies, who missed their true calling as bureaucrats, all over the place.