My grandparents once had a single Cochin rooster in their flock, all the other birds had clean legs. Because he is different and has feathered legs he is pecked at by the other chickens, they think that something is stuck to his legs because everyone else has clean legs, so the rip it off of him. The same thing happens with polish and other feathered head breeds. The other chickens don't like it and think it is weird so they try to make him normal. There's really no way to fix this unless you want to re home him or get more feather footed birds. If you get more birds like him then the other chickens will accept it as a normal thing.