That’s awfully ungenerous to your fellow HNer. Maybe it would be better to wait for his response to your question (“Why is that?”) rather than answering it yourself.

If I had to guess you're the kind of person who always thinks you're the smartest guy around. You know absolutely nothing about this person, just went on this rant against a strawman to feel intelligent.

Yes, that’s always a possibility. I try to check myself for this kind of behavior, and I don’t think that your description is accurate, but of course you never know for certain.