That's right. There are bad calls in every sport at every level of play. Learning to deal with them without letting it affect your play is part of the process for everybody. Some do it well, some do not. When I had kids in youth sports, you could just watch how parents reacted in the stands and figure out which players would be able to deal with bad calls without letting them affect the team. We have good kids, and good coaches. They will learn from this and put it behind them rather than hold on to it.