I don't know why people think they can tell you what to do on your own property. Are you legally able to keep chickens? If so then tell him that the last time you looked at the title to your property, his name wasn't on it.
thanks all for the advice -- i'll just keep being patient with them & bringing food...
unfortunately my next-door neighbor, who will have a (fairly distant) view of the (2/3 built, still empty) coop, is totally freaking out, accusing me of ruining his view and devaluing his property. very frustrating.
best,
laura