Edit: perhaps I should explain what the "this" is that you shouldn't do here. It's covered by this guideline from https://news.ycombinator.com/newsguidelines.html: "Please don't post shallow dismissals, especially of other people's work. A good critical comment teaches us something." (as well as this one of course: "Don't be snarky.")
The trouble with shallow dismissals, such as reflexive reactions to a title, is that they don't contain enough information to be interesting, and they spread like weeds in a thread—especially a new thread, because those are so sensitive to initial conditions. If they spread too much, they choke out good discussion altogether.
I don't favor OO either! The HN archives of yore have a lot of me arguing about it and I like a good OO bitch session as much as anyone. But for a good HN thread, we need comments that are about the specific work being posted, and this is obviously interesting work on teaching programming to kids.