Coaches are role models. Your parents and your players follow your example. If you practice good sportsmanship, so will they.
But if you complain about referees, yell onto the field, etc, so will your team.
So please be mindful that you, the coach, are the most important AYSO leader in the eyes of your team. AYSO provides free training so that you all can be the best coaches that you can be. Make us proud by modeling the excellent AYSO behavior we want your players and parents to follow.