I am a wheelchair user due to chronic joint instability and pain. I don't always need to use it. I can walk, I can run, I can even do a lot of sports with minimal modification...on a good day. On a bad day, I will briefly dislocate a kneecap just laying down after standing up long enough to cook, and yes, it hurts to pop it back into place about as badly as you think. On a good day, I can run a half marathon. On a bad day, I can't walk to the end of my block.
Contrast with someone who was fully paralyzed in an accident, who can't walk even a single step.
Contrast with someone who can start the day doing what I can on a good day, ANY day, but also just as reliably only has about 20% of my good-day stamina and has to move to a wheelchair after that.
All disabled in ways that are outwardly similar - but the accommodations we need aren't the same, because we can't all do the same things the others can.
Some disabled people can stand upright all day but start to burn out the minute they start walking. My lower body starts to scream in agony if I stand still for more than 5 minutes or so, but again - on a good day, I can run a half marathon. I've known of at least a couple of guys who can stand and walk for a good number of hours on end, but can't sit upright for more than a few minutes - it's stand up or lay down, period. Again, these are not the same. We cannot be treated the same. One of us being able to do something does not change the fact that another cannot.
I'm autistic and hyperverbal (could you tell? lmao). A good number of acquaintances I've met online have been autistic and nonverbal. Contrary to some stereotypes, I am chronically understimulated and constantly seeking out more intense sensory input, and overstimulation in an environment I chose to enter and can leave at will can be a euphoric experience (though when it's against my will it's every bit as miserable as the more commonly recognized cases); in fact I can't taste most of the classic autistic "safe foods" and the few I can taste I don't like, in fact some of them even provoke that "this isn't food" response in me! Needless to say, this does not make the experiences of people who are chronically overstimulated somehow invalid. I can go to concerts. Many other people can't, not safely. Meanwhile, many of those people can get by on much cheaper and simpler food than I can.
I'm mildly allergic to bees. The accommodation for this, obviously, is NOT the same as the accommodation for someone with a life-threatening peanut allergy. I can eat a whole PB&J without consequences; they can go on one of those shows where they get deliberately stung as a dare - doesn't change the fact that we can't trade those actions.
All this to say, if you're going to say "but I/my kid/my friend/my third cousin once removed have/has that same diagnosis or one totally unrelated to it and I/they can do this thing, so you should be able to, too!!" then what you actually need to do is shut the fuck up.