When you are losing badly you can look at it two ways:
- this sucks, why are we even here if we already know how the game is going to end?
- what a great opportunity to practice with a superior team for two hours!
If you are a "the end is the only thing that matters, and winning is the only reason to play the game" then you might find fault with the other coach's responsible actions.
If you enjoy playing the game, and desire to improve your skills, then while a win is nice, it's not the reason you're playing, and so you'd probably be happy that you are forcing the superior team to train you.
If you, as a parent, don't see the value in playing the game, then don't let your child play, or better yet let your child choose, and you shut your mouth and let them decide whether the game is enjoyable or not.