It's disgraceful to have 11 year old practicing a sport up until 9:00 on a school night. That means it's very likely that those kids don't go to bed until 10:00, which in turn means that they probably will not get 8 hours of sleep a night.
Bed at 10. Awake at 0700. That's nine hours right there at a minimum.
Myth...BUSTED!
Not very many people have any problems with practice going until 0900 PM . In fact, you might be the only one who does find it to be offensive. I feel sorry for you.