A diagnosis doesn't magically turn a switch on, if a person is autistic, they have been all their lives, even if they never get diagnosed. What is this invalidating bullshit?
As someone who worked with the community, there's nothing more annoying than people who are just a little quirky claiming they have some diagnosis.
Usually because they just want an excuse to not fit in.
Social skills are skills.
Very few people are just naturally good at it, most people have to work hard at it. And few groups work harder than people who are actually diagnosed.
It's just a lot of lazy people "diagnose themselves" and want to treat it as a get out of jail card for never working on their social skills. They want as much credit for their no effort result as people who have spent decades trying to improve their social skills to end up at the same place.
Like, just slapping a "diagnosis" on themselves means they don't have to try anymore. Even if they actually have it, being diagnosed means they'd have to actually do something about it. It's way easier to just claim you have it and not do anything about it.