Raising a "Normal" Child - Social and Emotional Learning

One day, while watching one of my son's soccer practices, I began to notice how the kids interacted with each other and their coach. If a conflict arose, there would be some words exchanged and maybe a few huffs and eye-rolls here and there. But whatever the problem was either got fixed, or it wasn't important enough to continue talking about. The ones that did require some intervention were brought up to the coach, who appeared to handle the disagreements appropriately and to everyone's satisfaction. The coach always maintained a very positive attitude and no one was ever singled out as "the problem." He was able to get everyone back on track.

So a question popped into my head: My son had difficulties getting along with other kids in his school, but he had no trouble working with his teammates in soccer, why was that?