Me? No. As their coach, I would have told the commissioner that I decide what's best for the team not what's best for his son.
But that's not the issue, is it? The issue is whether the coach thought it was correct. And it's obvious HE did.
"What kind of lesson and example is that setting for his son?"
The lesson is the Golden Rule: Those who have the gold, make the rules.
The son will also learn that 1) his father means what he says, and 2) there are consequences to disobeying the rules. Those two lessons will take him much farther in life than playing in the championship.