Common mistake: The opposite of "all HN comments on medicine are absolute garbage" is not "all HN comments on medicine are absolute treasure", but "not all HN c

Common mistake: The opposite of "all HN comments on medicine are absolute garbage" is not "all HN comments on medicine are absolute treasure", but "not all HN comments on medicine are absolute garbage", or equivalently "there's at least one HN comment on medicine that's not absolute garbage". This can be deduced indeed, but that gives us no information about your comment.