They do the same thing with other marginalized communities, like POC who complain about missing opportunities get rich black people shoved in their faces. Able people who live comfortably are made uncomfortable by the idea of there being a class of people who are forced to exist in poor conditions due to something they can't control, be it disability, race, sexuality, gender, etc. So instead of addressing the systemic issues of why that might be, they go, "well some disabled people are able to pull themselves up by their bootstraps, why can't everyone? it must be a personal failing."

Many Americans very much so believe that we live in a meritocracy, and anything that would combat that idea provides too much dissonance. Or at least I think that's what it is idk, I wish they'd stop trying to drag me into making them feel better because the fact i'm suffering makes them uncomfortable... lol