The coach shouldn't have made the wise comment about remembering how to play softball. If I asked one of my students if they forgot how to do calculus everytime one of them fumbled over it in one of my classes which requires knowledge of it, I would probably be having a meeting with my Dean eventually...
I assume the coach's intent was simply to make the point that he wants his players to be versatile, ie, a ball player is a ball player, and that if you can play third base, you ought to be able to play second base. But if the player went away thinking that it was a snide comment, that's still a failure to communicate. Hard to judge it without having witnessed it or gotten the coach's side.