Found the bad neighbor in the neighborhood.
I think he used to live next door to me. I'm not a lawn Nazi or anything like that, I do a good job of keeping things under control, but I don't stress and start spraying at the first sign of a weed. (Except Creeping Charlie, that stuff will take over fast) Even dandelions, I used to just go out with a root tool I had and yank them, one by one. Mainly because I used to have good yard neighbors and only had to worry bout a couple a year.
That is until the jackass next door to me moved in. Not only was he against spraying of any kind, he also only mowed about once a month. So his yard was full of about 10 inch high dandelions, all spreading their love to the rest of the culdesac. As I said, I'm not a yard Nazi, if you don't want to spray for dandelions, fine, but at least keep them mowed so it doesn't look like you are growing a mini forest in your lawn.
This guy caused half the houses in our culdesac to hire services to come and spray to keep things manageable. I even told him that his approach to "A Clean Yard" actually worked against him as no one ever really sprayed or did much with their yards other than a little fertilizer here and there. He let things get so out of control, he now has a culdesac full of chemicals to try and prevent his mess turning into everyone's problem.