He just needs gentle coaching:
Instead of "shut up and play," say "Keon, what are some ways you can think of to have Mr. Allen throw you the ball more often."
Instead of "man up," say "Keon, how do some of the other players perform after they suffer injuries? Is there a lesson in there we can think about?
Instead of "pull yourself up by your bootstraps," say "Keon, what are some ways to ensure our boots stay on our feet better?"
Instead of shouting, raise your words, not your voice. After all, it's the rain that grows flowers and not the thunder.
And so on. I think it's the coaching technique of the future.