"MY WAY OR THE WRONG WAY!!"
For a start, you should be cutting your grass at 2pm or e4pm or ....any other time that he hasnt dictated! They need someone to blame for anything that isnt perfect and that is now you. I rather suspect that they have always been like this, I wonder if the former owner got her lawned mowed at the wrong time.......
I had neighbours like this, they blamed literally everything on my kids. She complained that should couldnt park in "her" space (on street parking) because of "your kids friends parking there", eldest was 14 at the time ffs. She stormed round one day yelling that my kids had thrown shit on her conservatory roof. Not literal shit....moss and crap like that. I asked when it was done and she said "It was in the last two days as it was fine when we went to (wherever) and now its all there. I am sick of having fucking kids living next door".
I thanked her for telling me and said I would congratulate the kids. She went CRAZY. I mean properly librarian poo. So I was proud of them?! I bet I encouraged them to vandalise her property!!!! REally mad. She would report me and get an ASBO and get the police involved and get me evicted etc etc.
I said that A) I own this house, she can't get me evicted (she had me down as some single mother benefit scrounger, her words) and B) yes I would say "well done" to the kids because since 4 days before they had been in North Wales with their dad on holiday so if they managed to hit her roof from nearly 200 miles away, it was a hell of an achievement and C) she might want to get her gutters cleaned so the squirrels wouldnt keep kicking shit out of them.
Her house went on the market less than a month later and it turned out that my other NDN is her neice and couldnt stand her either!