Well, then give him back and tell them to cull him. No matter what the story is, I would not expect someone to take a beating for taking care of my birds. THAT is unrealistic. If you want to keep doing so, be very aware, the attacks tend to get worse, and they can get very sneaky.
But a lot of...
Truthfully roosters have ruined the whole chicken experience for a lot of people. I would cull the leghorn. Either by processing him myself, or offering him for free on craigslist. Getting attacked for bringing feed and water is not enjoyable.
Roosters can be very aggressive, dangerously so. I...