> I feel like this quote in particular is intended as a personal attack
In context, it's clearly meant to hint at a purported pattern of problematic behavior, the specific instances of which the author is unwilling to get into, for whatever reason. While gossip is always unsavory to some extent - anonymous gossip all the more so - I think we should be respectful of the author's choice here and not take what they wrote as being by definition a violation of civility norms (as a personal attack would be).
In context, it's clearly meant to hint at a purported pattern of problematic behavior, the specific instances of which the author is unwilling to get into, for whatever reason. While gossip is always unsavory to some extent - anonymous gossip all the more so - I think we should be respectful of the author's choice here and not take what they wrote as being by definition a violation of civility norms (as a personal attack would be).