tl;dr: frustration towards people in the cryptocurrency scene, feeling they've gained wealth through luck rather than skill or hard work. Also a disdain for how some cryptocurrencies are overzealously promoted.
It was the top comment of a 640 comments thread, so it presumably had a lot of up votes and is representative of how HN feels about cryptocurrency.
Unfortunately, the low quality discussion on crypto related threads dates back a long time and some of us just got tired of always correcting the same misinformation and low effort criticism.