I haven't looked at actual stats for this, so this is just based on what I've seen on Tumblr, but I'm not surprised that so many autistic people also have OCD, especially moral OCD.
When you're constantly corrected on your own actions, intentions, and interpretations of the world, taught that any sentence you think is innocent can be horrifically offensive (and that you knew that even though you didn't), scolded for the way your disability affects you and accused of lying when you struggle, fuck, why wouldn't autistic people have "I'm terrified of doing something wrong and am desperate to comfort myself" disorder? I can't say a single sentence online without checking for how it could be misinterpreted or used as evidence that I have done something wrong, hurt someone, acted like the scum of the earth – I feel the need to put a disclaimer that OCD isn't just how I described it above, because I'm afraid that someone's going to be bothered by that simplistic description – because I know people aren't going to give me grace for clumsy words, even if they know I'm autistic, even if they know part of my autism is wording things clumsily.
And I'm not surprised autistic burnout is such a common problem, either. When autistic people check over their words like this, they're expending energy to accommodate intolerance and ignorance from others. Even for fully verbal autistic people, that's going to take a toll.
That's part of why I like tone tags and just stating the tone like (genuine), I think. People will ask "Why don't you just add a sentence telling people what your tone is?" and the answer is that those sentences also get misinterpreted! Those sentences also get scanned for tone and intent to hurt that isn't there! So that's another sentence that I have to check over and over and over again so people don't read it and think I'm the scum of the earth! Just let me have my fucking tone indicators!! At least I know if someone ignores those that they're being an ableist prick and not just acting "normally" towards me, sure to get all the sympathy if I get frustrated that I can't say even a single sentence naturally without people hating or "correcting" me for it! Because yeah, it's not nice to pick on autistic people, but I'm just an asshole on the internet who didn't cover all possible nuances and sounded a little too snarky, which means it's okay to be a bitch to me!
It's always on me to watch and change my words, on me to play 3D chess in conversations to anticipate outcomes I don't understand, on me to get over my distress so I can "properly" apologize for inevitably fucking up the simplest of fucking conversations no matter how rude the other party was being, and never on others to give me any grace or apologies for my literal fucking disability. It's really no wonder that I'm always worried that I'm going to say something wrong and unforgivable – according to ableism, I am. And the only way for me to move forward from that is to accept that I am only as much of an asshole as the people who put me in this position in the first place.
Still, I'm so fucking tired. I just want to make a shitpost or point out a pattern I've seen or correct some misinformation without people calling for my head if I choose not to work overtime to make it look like I don't actually have a disability they claim to accept. For the love of fuck can I please just be allowed to chill. Please.