That reminder alone will stop much of the pettiness that divides us. The sheep are not all the same. He calls some lambs and others sheep. As we care for each other, we must understand that each person is unique and different. Our methods, words and actions must be tailored to the situation.
Some people can handle a big steak.
Others need a bottle. Still others need that strained stuff. We are not only to feed them, but care for them. It's not enough to simply recite Bible verses to each other. I don't know a lot about livestock.