I may be brand new to chickens, but I look at it this way:
Websters defines "domesticated" as "to breed or train (an animal) to need and accept the care of human beings." (emphasis added)
As far as "need" goes: my chickens depend on me to provide food, water, shelter/safety, and medical care when necessary. Granted they can forage for their own food, but I'm pretty sure they'd get eaten before their first day of freedom was even over. They get confused if I move the waterer from one side of the run to the other, so I'm not convinced they could find a water source on their own. And, judging by what I've seen so far, some of my chickens would be dumb enough to try to roost in the same trees as the owls and hawks (I say that with love, of course!). Without my care their odds of surviving aren't too great.
As far as "accept" goes: my chickens know my voice and get excited when I talk to them. They come running when I call them. They love to be picked up, petted, and 'loved on.' They happily accept food and treats. They are content to live in the shelter I constructed for them. They comply with routine health inspections.
Now compare that to a raccoon, hawk, snake, or any other "wild" animal that ALSO lives on my property (AGAINST my wishes). Those animals don't need me to provide food or water. They dig their own burrows and build their own nests. They certainly don't get excited to see me, and I can't imagine any of them being happy to be picked up and snuggled with.
Even if someone in your neighborhood kicked up a fuss, it would be pretty easy to make an argument that your chickens clearly fall on the domesticated side of the fence. If the annoying neighbor disagrees, ask them to hold one of your chickens and then hold a possum. They'll figure out the difference between domesticated and undomesticated pretty quick.