There’s no mention of a realtor in the article. The attention the owner is getting for the For Sale By Owner sign may actually increase the value of his home to a potential buyer.
A home next door to a retired couple who doesn’t like barking dogs is a positive selling point.
the retired couple are renters. they are harassing the neighbor who is an owner. in my book, owners > renters. let the old curmudgeon renters move somewhere else.