They have to have some sort of grounds before they can successfully sue you... just being unhappy is not going to win a lawsuit!
You can sue for anything at all. Its the American way - and if they do it in small claims court, you can't even count on an early motion to dismiss. The point of which, for some, is **NOT** whether the lawsuit is ultimately successful, its that the process of dealing with the Courts is punishment to the lawful owner of the rooster(s).
Now, I am NOT an attorney. This in NOT intended to be legal advice. I'm simply reasonably well read, and have some odd choices of reading genre. In MA
@Boppo , there are two kinds of Nuisance, "
common" and "
private". What we are talking about here is a private nuisance - a claim that the OP's posession of roosters interferes with the plaintiff's quiet enjoyment of their land. That case *WILL* go to court.
The next thing you need to understand is that, in the US, small claims courts are generally Courts of Equity, NOT Courts of Law. Explaining the difference is more time than I want to take on this post. Important here, it allows the Small Claims judge to do some pretty wild things.
The last thing you need to understand is that the law of Nuisance isn't a "law", its a "feeling", and in that regard, its utter BS. Anybody can open their state statute and look up the law on murder, or speeding, or whatever. If you do "X", and are convicted, these are the penalties.... Nice and simple, clearly spelled out. The law on nuisance??? I'll summarize "If the judge hearing your case thinks its a nuisance, its a nuisance." Nuisance law is so untethered from the rest of the body of American law that Congress (State and Federal) has been taking steps to reign it in. Many States have "Right to farm" laws - which make farms immune to claims in nuisance for commercially acceptable operations consistent with standards - so the new neighbor can't buy property next door, then force the farm to shut down because it stinks, is noisy, whatever. But those laws apply (generally) ONLY to large scale, ongoing, commercial farming operations - not the backyard flock of a half dozen birds.
OP will have to go to court, show that roosters are permitted, that they aren't in violation of noise ordinances, or zoning, or mandatory setbacks, whatever and that since roosters make noise and all their rooster-related activity is normal, it must therefore be lawfull - and hope the Judge agrees.
again Judges who have found lawful activities to still constitute a nuisance are so prevalent that State and Federal Congresses have had to start cutting them off at the knees. The "Right to Farm" act, as but one example. Nuisance law is being used to try and extract money from big Oil over the fact that we all use the products of big oil, and therefore pollute the environment - not that their actions are illegal, or that selling oil is illegal, but rather that they are responsible for the consequences o our use of the oil they sell. Similar claims are advancing against drug manufacturers, gun manufacturers, over employer COVID mandates - basically any deep pocket operating legally but currently on the political "outs" with a segment of society.
This is not a case where one should put their faith in the legal system.
Or so I believe as a reasonably well read consumer.