It *is* a small subset, but I don’t see what’s so surprising. HN is just an ordinary tech community; it’s not surprising for people from any tech company to show up there.
It's uncommon for me to have takeaway pizza, but I don't think anyone I know would be surprised when I do.
Your friends probably wouldn't go out of their way to ask you why you ordered a takeaway pizza which is uncommon. But if they did ask, it usually means they were surprised.