Some people are just moaning, miserable, joyless ******.
You have my sympathies with your neighbours.
And I am totally blessed with mine, who think it is great to have chickens as their neighbours, especially as they can buy our spare eggs.
We often have the local kids knocking and asking if they can come and visit our chooks.
Having chickens next door is far better than having barking, yapping dogs and the smell of hot dog's excrement on a sunny day.
Don't let it get you down.