Several people hit upon the answer that always works, stop feeding the rats and they will leave. You have a wonderful red and white rat feeder hung inside your coop, I am sure they are grateful for the 18% protein. I know, the company markets them as "rat proof" but the amazon reviews say otherwise. Likewise, having the feeder off the ground does nothing to stop rats from jumping up into the feeder. And the cost, $59.00, that is within 10% of an actual metal treadle feeder that will stop the rats.
Oranges, mostly carbs and 87% water, less than .2 grams protein per large orange. End result, a rat would starve to death on oranges. Without a source of steady protein (AKA chicken feed) the rats would have to leave or be severely limited in number in line with the available natural food.
First step, make sure your bulk feed is in metal containers. Second step, replace the plastic rat feeders with a good metal treadle feeder. Third, clean up any debris, plants, or items that allow the rats to travel to and from the coop so their natural predators. Done. Rats will leave quickly once they begin to starve.
Do a forum search for Howard E posts. He is probably the foremost expert we have on rats and has done a lot of research. Here are three of his posts that explain everything you need to know about rats and how to eliminate them for good. Actually there are three steps, sanitation, exclusion, and elimination. You do the first step correctly by putting feed in metal containers and buying the right treadle feeder and the other two steps will not be needed nearly all of the time.
https://www.backyardchickens.com/threads/rat-control-the-video-series.1337456/
https://www.backyardchickens.com/threads/rat-control-101.1283827/
https://www.backyardchickens.com/threads/rat-proof-feeder-review.1180514/#post-18610285
Or do like others do and make a hobby out of trying to outwit rodents by building a Fort Knox coop, trapping, or poisoning. Spoiler alert, the rodent species win every time.