I swear to god, behaviour like this is one of the reasons why this subreddit has such a bad reputation in the fandom
I genuinely love this sub as a place to talk about tropes and just discuss the fandom in general, which is why stuff like this is so disappointing to see.
Everyone is allowed to moderate their expericence on AO3 and in the fanfic space in general. Going after people personally because you're butthurt that they blocked you and going out of your way by leaving a bookmark because you can't comment on their fic is in no way acting according to fanfic etiquette and against the spirit of this sub, at least in my opinion, because this is no where near of being respectful of the author.
I debated if I should share this here at all after stumbling over it but because the bookmarker is a regular poster on this sub I wanted to hear your opinion on this.