It’s just that children are used as the most common scapegoat in every game, usually with no more evidence than “This one time”. I’ve always held a strong opposition to the argument both when I was a kid being told these things & now as an adult.
Children aren’t a universal blanket category that ruin the game is all I’m saying. I don’t even agree that they’re largely more common. Yes, there are young children who ruin the game for people, I certainly won’t deny that. And they certainly are numerous, I won’t deny that either. But that applies to people of any & all ages. Youth =/= inexperience.