Why would anyone be upset with people sharing FLOW?
Are you fucking serious right now? Did you actually read what they said? Want is wrong with you? They're not "peeved" about "not being able to control the conversations of others", they're pointing out that because of Hacker News's lax and irresponsible moderation and disturbing overlap with much worse communities, it is a breeding ground for endless hate and harassment that can, and has, driven people to suicide on other occasions. That's way more serious and understandable, and playing that down as just someone being "anti free speech" as being part of the problem.
From what I can gather after looking at previous posts on Asahi Linux, as another commenter suggested, the author of that message is furious that some HN users were talking about a cartoon character alter ego that he uses to make video streams. Seems to me like he's overreacting a bit.
Also, don't even start with the whole "Asahi Lina = Hector Martin" thing. You're literally echoing a Kiwi Farms thing and wondering why people accuse HN of having an overlap with that site?
Perhaps you could link the comment threads that you believe is evidence of what he's saying in that message?