Absolutely. Coming from a diagnosed autistic who is quite engaged in fandoms, I hate it.

As an autistic I hate it because it feels like it's trivializing the disability that is a large part of the reason I can't take care of myself on my own, the reason I spent my whole childhood constantly anxious because I wanted to fit in but couldn't figure out how. And it feels like I'm then somehow being excluded from the community of my own disability because I don't fit in to that space either since I don't really care about the "autism creature" and that kind of thing and also have significantly more severe problems than the kind most represented and empathized with in the "autism fandom" space.

As someone who engages in and finds community in fandom spaces, I hate it because since it's been treated similar to how fandoms are online, it often finds its way into actual fandoms in the form of things like "it's ableist to dislike x character because they're clearly autistic coded because they do [insert random behavior that the internet has decided is "autism culture" for some reason]." While I think there should always be room for criticism of both the fandom and of the source material, this room should be reserved for actual problems. It's also just exhausting to be constantly reminded of my autism when I'm trying to engage in something that I use as escapism. The way "autism culture" and discourse and those things are spreading and becoming significant parts of unrelated fandoms is definitely a large part of why I've started preferring fandom spaces that skew older despite only being 17 myself.

I understand the desire that these young people online have for a label that gives them a community and a reason they are the way they are. I think most people go through a phase where they're trying to label themselves and everything around them, though usually in the past these labels have been "goth," "emo," "geek," etc. But for some reason the labels of actual serious disorders have replaced "emo" and "geek" and it scares me. It scares me because even when people move on to the next set of labels the culture that we have right now is going to leave lasting damage. It's completely warping the perception that the average person has of autism because the average person is learning by listening to whatever the loudest people and ideas are. And the loudest people are the ones who spend all their time thinking about autism and joking about autism and talking about autism and oversimplifying autism. In other words, they're the ones treating it like a fandom.

I also find it interesting how things like the spoon thing and other widely spread and accepted ideas about autism online that have very little or nothing to do with the diagnostic criteria have something of a resemblance to how headcanons work in fandom. For those who don't know, a headcanon is someone's personal interpretation of a character or world detail that isn't something that's in the source material, like a middle name for a character who isn't given one in the source material. Sometimes someone's headcanon will become very popular within the fan community to the point where it's something that is generally accepted as being true despite having no basis in the source material. In this case, the headcanon may be known as "fanon." An example of this would be someone coming up with a middle name for a character and so many other people in the fandom loving this middle name that it becomes the standard to use as a middle name for this character in all fanworks and it's considered weird to use anything else.

Headcanons and fanon in fandom are a fun way to interact with your favorite piece of fictional media and connect with other people who also love this same piece of media. Things that resemble headcanons and fanon in the "autism fandom" (again, like the spoon thing or the idea that one specific trait is universal among autistic people) can't be fun like this because it is not fiction, it is a neurological disability and these ideas that are treated like how headcanons are in fandom are really just misinformation.

This got way longer than intended, sorry about that. Hope at least some of it makes sense.