Excellent points and I agree with almost all of it, but I think here you miss something.

Social power is power.

There's a difference between sharing a personal story that went well, or poorly, and making it very clear that you view DiCaprio's behavior as immoral and that such relationships are to be shunned in general, or undermining expectations of personal responsibility in younger women. You can exert immense dominance via telling stories--yes, it's a softer kind of dominance than locking someone up in prison or punching them in the face, but if you look at the magnitude of effects of bullying in girls and boys, and note that practically all of the bullying by girls of girls is this same kind of soft power (e.g. telling stories about Alice behind her back), you have to recognize that the power is not very much less. Maybe it's "matriarchal mode" power rather than patriarchal mode, but what difference does it really make if either way can, with the gain turned up, result in depression and suicide?

So the content matters very much. As group social pressure, it is hierarchical (the "influencers" at the top), it's dominance (if anyone is shamed into behaving the "right way"), and if social media is an institution then it's institutional too if that's what you're being bombarded by. (Why else would we care about worrying TikTok trends?)

Within the bounds of "our stories" there is everything from "here is my personal experience; maybe this can help you avoid some mistakes that I made/I saw others make" which is hard to construe in any particularly negative way (maybe some mild statistical bias towards sharing problems), through to promising social exile to anyone who steps out of line, which to social creatures like (most of) us is about as bad as anything that can happen.

Therefore, if there are complaints about the content of the stories, they can't be dismissed by "they're stories!" The nature of the social power of the stories has to be considered (as Penguin did, and in the rest of your story, you did) on its own merits, not dismissed.