Louis Rossmann

You might want to look up a definition of "parasocial." It sounds like you're taking that term to mean something other than the common usage of the term. It's not any kind of insult or accusation or anything. ("Unhealthy parasocial relationship" might be, though Ilandar didn't use that phrase specifically. Ilandar is accusing you of making some logical leaps without any real knowledge of what might be going on with Rossmann. I'm not saying you are or aren't making logical leaps, but just the word "parasocial" doesn't mean anything like that.)

"Parasocial relationship" is just the term used to describe the relationship between a fairly well-known public-ish figure and their audience. (Though I think it usually tends to be used more when a "social-network-ish" platform like YouTube is involved than with, say, Hollywood actors.) If you've watched some of Rossman's videos, at least enough to know a little bit about his public persona and if he also doesn't really even know in specific that you exist (or if you're no more than a username he's seen on a bunch of YouTube comments or something), the proper term for that is "parasocial relationship" whether you're making logical leaps or not. If you've watched any significant number of Mr. Beast videos but don't know him beyond that, you have a parasocial relationship with him. I follow the Google software engineer Rob Pike on Mastodon and read all his toots. So I by definition have a parasocial relationship with Rob Pike and he with me. That's not to say Rob Pike knows I exist, nor that I have any special knowledge about him, nor that he owes me anything. (And in fact by calling my relationship with him "parasocial", I'm basically explicitly saying I don't have any relationship with him beyond consuming some content he publishes publicly.)

Kind of like, oh, I don't know... implying a Lemmy user you know nothing about has a unhealthy "parasocial" relationship going on with a random Youtuber based on a single post 🙂

Again, I'm not taking any position on whether there's any thing "unhealthy" going on with you. (I haven't watched enough of Rossmann's recent content to know whether any of your statements about him are justified or not.) But if he's a "random Youtuber" and you don't have any other relationship with him than having watched and maybe commented on a good handful or more of his videos, then I can think of no more perfect example of a "parasocial relationship."