"After all, this website is full of people who have no reason to have known about an obscure niche language, regardless of it's significance and importance."
This is Slashdot and not CNN or People magazine online. This is News for Nerds.
"I'd say it's more troll like to judge people for not knowing about a language that is, at best, obscure and not well known outside of academia and research."
Ahh... You see that is where you are missing it.
Lots of people don't know about Haskell and that is fine.
I judged people not because they lacked knowledge but because they dismissed the value of that knowledge and make no effort to increase their knowledge.
Or to put it in simple terms.
Hear about the death of the creator of something you never heard about.
1. Google it and learn what it is.
2. Dismiss it because you don't know about it.
Which is the better path?