I guess because it seems so entirely content-free. It's riffing entirely on the title of the post — the words "explain" and "mystery" — and not on the actual su

I guess because it seems so entirely content-free. It's riffing entirely on the title of the post — the words "explain" and "mystery" — and not on the actual subject, which is glass. All the other (human, presumably) commentators responded to the subject, and talked about glass. It's as if I said to you "Guess what? I just landed the job of my dreams!" and you replied "Guessing is an interesting pastime, people have been doing that for thousands of years." To an AI it might seem like your comment followed mine, but a human would walk away from you.