I think you've hit the nail on the head. A lot of the differences in what is considered normal and appropriate social media behavior I really do think comes down to whether you have ever had a lot of social media followers or not. Cohost doesn't have Number but I was still one of the first 100 users and my posts get a lot of attention. And I've previously had 3000+ followers on twitter etc. for many years. So my experience of Social Media Interactions From Strangers is just very different than people who have only ever been the follower.
If just the one person over shared in my notifications that's one thing, but it happens very frequently and has been happening for years and my empathy around it is just eroded. I can't even count the number of times someone has just randomly DM'd me or sent an ask or reply stating that they are imminently going to kill themself. You can't just continuously receive that shit with absolutely no idea how real it is or serious they are and continue to allow yourself to be emotionally invested in every single stranger who says words at you. So instead it just becomes really infuriating.
I experience it as someone emailing those words directly to me. I experience it as someone walking up to me on the street or at the park and just like, not letting me exist in public.
And yeah I lose the distinction between the "I'm going to kill myself because of your post about COVID precautions" and the "Wow you feel happy for a single fucking moment? Wish that me." They both suck.
I simply can't have this shit put on me. It's not appropriate pro-social behavior. It's rancid and shitty and people shouldn't do that to strangers. It sucks for you if yo don't have anyone to talk to about your problems, but that to be quite honest, cannot be the problem of any random person online who you decide to make it their problem. They didn't sign up for that and are not in a position to honestly do anything productive about it either. You don't know what's really going on in their life, or what their life has been, or anything. You only know what you see on social media, which the more follows you have, becomes less and less accurately reflective of your total life experience (and also, the older you get, such that there is far too much life for me to share it all publicly all the time to everyone in every post.)

