I learnt of the news about 8chan from this thread: https://news.ycombinator.com/item?id=20616055 — which was on the HN’s first page before it was replaced by the slightly longer thread you linked to. The top comment in that thread is decidedly against the chans.
There’s also been a lot of mentioning of Popper and his paradox of intolerance in these threads. A post  in the thread you referred to (it also was among the top ones when that thread appeared on the front page), for example, began by saying that "Popper taught us that we can't be tolerant towards intolerants" ("taught us" implying that this statement has grown to become general wisdom).
If HN’s prevailing sentiment has since turned in favor of 8chan, I am very happy to hear that.
1 - https://news.ycombinator.com/item?id=20611816