[charlie22]

How do we teach our children good sportsmanship if immature parents behave with this kind of bad sportsmanship?

Bingo. We have a winner. And bad sportsmanship includes heckling the refs, the other team, certainly your team and the coaches of both teams. Cheer your team on but otherwise just shut up. I've had the "pleasure" to sit around people that yell at the refs for bad calls; 90% of the time the refs were right and the people screaming didn't know the rules (they watch too much NFL and think the rules are the same or for some reason they think their view of play is better when they are sitting 50 plus yards away than the ref right next to the play). I've had the "pleasure" of sitting around people screaming at their own coaches for play calling or for personnel on the field; as if they had been at every practice and saw which kids were practicing better or as if they had scouted the opponent and determined "what should work". Only one thought comes to mind when I hear these arm chair qbs and coaches: idiots. And if you don't think the students in the stands and the players on the field don't think to themselves: "hey, if the adults in the stands can do it, so can I", you're nuts.