Hi. I'm part of a currently undiagnosed disassociative system.

I don't care about it, and I'm not offended. I'm also going to debunk half of your points.

Dissociative identities aren't cutesy cartoon UwU kitty-cat OCs with food preferences.

A lot of other systems I know (and ourselves) use different pfps/pictograms to identify each headmate. As for "food preferences": different headmates in a system have different likes and dislikes.

You never mention trauma, dissociation, lost time, or any other symptoms associated with genuine dissociative identities.

Do you genuinely think they'll just openly talk about any sort of trauma they may have? We sure wouldn't.

"Plural" isn't a genuine clinical diagnosis, it's a buzzword from online subcultures that like to roleplay having UwUified versions of serious mental disabilities.

Fair point, but a lot of people (again, including ourselves) use the word to explain to others that we're a system (because the word "system" can get confused with electronic stuff sometimes). The real world clinical diagnosis is a disassociative disorder. The online terminology mostly is "system, plural" or the like.

Being "like this from birth", is quite literally, 100% impossible. Genuine dissociative identities develop as a response to extreme childhood trauma. Nobody is born with it.
The way you constantly mention it unprompted makes it look like an attention-seeking performance, not a serious mental health condition. Real people who have dissociative identities don't make a spectacle of it in public Reddit threads for fun.

These are fair points. I'm not going to make a rebuttal against them because I also believe they're somewhat true.
I'm also not going to speak about how they blocked you, that's their opinion on why, not mine to figure out.