:goodpost:
Enjoy your birds first and foremost! Some people are just grumpy.
I usually don't go out of my way to upset the neighbors, but some neighbors go out of their way to get upset. I hope you make a new friend.
What is the concern? Disease? I'd be more concerned of the commercial coops.
What is the fence on the property line? May be time to upgrade to a chicken proof?
He is afraid of his livelihood. I'm just not certain how justified this fear is.