Well if it comes to that, so did I -- but, well, was I really that good at arguing and debating? Not sure I'm all that much better right now.
Even if he, and you, and perhaps even I, were good debaters at the age of 12, most young children aren't that good. How can they be? Lack of experience for starters. Still developing, still so much to learn, and so on. So even though I'm probably wrong to be cynical I don't see that I'm wrong to be surprised.