I see this mostly when people post in relationships.
Someone will type out a lengthy post (that can basically be condensed to 'leave the tosser') including links to easily Google-able charities, the tone of the post is always very authoritative (you must do this, you must do that) and reads like it has been written by someone that considers themselves an expert on the topic.
No problem, all good even if I do want to roll my eyes at yet another essay essentially trotting out the same information.
The kicker usually comes about three or four posts after, one of the essay writers fan girls shows up essentially to congratulate them on giving such wonderful/amazing advice, fan girl has nothing to add but just wants to point out how amazing essay writer is. From this moment no one is allowed to disagree with essay writers advice or fan girl pops up with robust defence and usually a few insults to the intelligence of anyone who cannot see what is so amazing about essay writer and their opinions.
This usually ends up in a bun fight and anyone else's advice is lost in a sea of posts either arguing with or agreeing with fan girl (essay writer is long gone being an authority on something else!)
Aibu to wonder why some people on mn almost hero worship certain posts to the point they get massively upset if another poster disagrees with them?