My mums gone through the same thing as you with a man in our old area, he used to rush out when he saw my mum pass his house because there was a public alleyway where my dog without fail always went.. anyway my mum is one of these people who would go home to get a bag if she ever ran out because she doesnt agree with leaving it so shes always got about 6 extra bags with her.

This man accused my mum of not picking up after my dog and she was mental over it saying you cant pick up a dogs pee! he said he was going to report her over the dog mess down that alley way even though he actually saw my mum picking it up while he was standing over her.

Some people just have too much spare time and just talk down to them and make them realise how stupid they are being just whatever you do dont stoop down to their level its exactly what they want, just rise above their childness and eventually they get bored with it