I thought I would chime in, since I've had actual experience here. A neighbor who was an older guy, liked things to look a certain way on our block, and was generally intrusive, though I know he thought he was being super helpful. Some things I didn't mind, like he'd pull in everyone's trash can after the trash truck came. Other things I did mind, like a day after I moved in the house, he came over, introduced himself and asked for my house key if I decided to change the locks (he had everyone's on the block "just in case"). I knew he wouldn't break in teh house or anything, but goodness, what if someone broke in his house and found all the keys or something? Plus, it's just weird. I, of course changed the locks and just didn't tell him. We had other instances of him shutting my dog inside when I had intentionally left a certain door open in the back so the dog could come in and out of the mudroom when I was gone overnight.
Aaaaanyhow... he was a sprayer. For such a old-timey gardener, I was actually surprised at the level of disrespect he had for the land - over-tilling to the point of practically needing all the fertilizers and pesticides. So, were are both gardeners and I would just see him outside all the time. It was much less confrontational than having to knock on his door. We chatted over the fence once a week or so, just small talk about the garden. I think that conversation went something like,
'Hey Norman! Your flowers are looking great! blah blah'... conversation turns to my yard and how I was pulling the poison ivy from the woods right next to it (he had been spraying round up in my situation). "I noticed you sprayed my garden and yard over the fence for the poison ivy" He says yup, he didn't want it spreading to his yard. I said, "Thanks for thinking of us, but I'd prefer to just pull it by hand. I'm doing an organic garden and yard, so I'm not using any chemical fertilizers or herbicides". He just shrugged and was like, "Okay, I won't spray over there, but I think you'll have a hard time keeping up with that without any fertilizers and such!" I laughed and said, "Yup, looks like I've got my work cut out for me".
He never sprayed after that into my yard, but I know he wanted to. I remember being out there doing some slug control in a particularly sluggy year, and he was just standing at the fence chuckling at me and saying "You know they make products for that, right? Probably not organic but it'd do the job" Me: "I'm a sucker for a challenge"
I have since moved from that house, but I know the new owners also organically garden, so hopefully I've helped make the path easier!