Well he may have overreacted some, but i get where he was coming from. Imagine if you were working on a painting for a long time and put some effort into it, showed it to your art class, and then someone came up the next day and showed a much better version of your painting that they made, and everyone was 'wowed' and forgot about your efforts. You see, hes not thinking about this just as a tool to serve graal regardless of who contributes to it, hes thinking about it as an art medium as well. And thats why hes getting so defensive, may it be a tad too much. Just trying to clear things up here