Earlier quoted context omitted.
He mentioned getting some egregiously awful comments, specifically over email. I quickly scrolled through the HN thread and didn't see many, not on "nazi" or "death threat" level. Perhaps the people that read HN and then email other people are not innocent, but there's a huge gap between the number of people who comment on HN and the number of people who just read HN. I think HN comment posters are generally innocent…
The HN commenter literally threatened to sue the developer, even calling the developer a "good target". That sort of combative language is toxicity.
HN mods responded, the comment was flagged and killed and downvoted to hell.
Also, the way it was written may not have been the way he intended to come across. Read dang's comment, as well as his downthread comment.
All things considered, HN is definitely not a bad place.