Kill your neighbor with kindness. Retaliating in a negative manner simply adds fuel to the fire, giving us peaceful chicken keepers a bad reputation. Now I'm not saying you should compromise your own happiness and bend to their every desire, but if you're just as irritating as they are, how does that make you look? Well, it makes you look just like them. Good luck, check your local ordinances. Just because you are legally allowed to keep your chooks doesn't mean your neighbor can't do anything about it...and if you return the grief they may make it a priority of theirs to try and change those local ordinances so you aren't allowed to have them anymore. Again, good luck.