Essentially because every HN post concerning cryptocurrencies has become a joke, and long threads of cryptofanatics and cryptosceptics throwing shit at each other. No one is willing to just have rational conversation on the points they agree/disagree with, but instead write attacks like: "Hahahahaha this is hilarious, where are all the bitcoin {fanatics,sceptics} now" that don't contribute to the discussion at all. You will always get downvoted by one of the sides. Personally, I would downvote you if I could for adding yet another stick to the bonfire.

To be honest, this looks like a quarrel between baboons that have invested too much, and baboons that have shorted too much. I've never ever seen HN in such a state and hope to not see it.

People are going to downvote comments, whether it's pro or con BTC, where the level of conversation feels like Reddit or just generally low-effort me-too type stuff. "hahaha" type sarcasm is why many of us come here instead. Apologies for dissing Reddit, but that's what that reminds me of first.

Like the other commenter said, it's about how rational the comments are.