The nastiest response I encountered was at the end of the GitHub issue thread, right before the maintainer deleted it. (He also cites it in his postmortem.) It said things like "you should never write Rust again," with very little substance.
The problem with the r/rust thread, AIUI, is less "far, far, far over the line" and more just a huge volume of the same sorts of criticism. It sucks to see such a response on that scale, but it's harder to characterize any individual's comment as "nasty."
Yeah, that comment on the GitHub issue was definitely over the line, but it wasn't on Reddit. The comments in the subreddit were higher in volume, but way more reasonable.
The problem with the r/rust thread, AIUI, is less "far, far, far over the line" and more just a huge volume of the same sorts of criticism. It sucks to see such a response on that scale, but it's harder to characterize any individual's comment as "nasty."