"You can't be disabled I'd you can do this thing". Look- here's the thing. We push ourselves because society has led us to believe we have to be able to. Even when we're at breaking point, we keep pushing. And later, we'll think "it wasn't that bad, I'm exaggerating and damatic".
We know no bounds, there's an intertia that keeps you going while your brain screams in agony. No wonder many of us have dissociative symtoms, that's what protects your brain. It's destructive, but hard to stop. It's hard to undo this programming, to realize what's going on.
And even when you do, starting to set boundaries and going back to be aware of your bodily and mental limits is hard. Because where's the limit? You can push yourself so much it's hard to figure out. You're used to ignoring your body screaming for help... Where do you even stop?
And if you finally start to set limits, society will rebel against it. "You were able to do this before, why not now?". Gaslighting. Shame. Blame... It will all flood you, targeting those insecurities you already have. Feeding that voice that says "you're exaggerating".
Society profits off gaslighting and abusing disabled people for profit, often making them not realize they're disabled. Once they've pushed themselves over breaking point, with long lasting mental and physical consequences, it abandons them. No support, no money, no nothing.