Yeah, I agree. But sqbr (how do I do the equivalent of <lj user="foo"/> on this site?) might be able to explain where "crazy" does or can go wrong, or provide a reference which does.

I think there's a difference between "ablism" and prejudiced thinking with which I'm more familiar: sexism, racism, class prejudice et al. The difference is not that it's less bad or in any sense more justified. It's that it's differently inflected in relation to the concept of equality, because "disabled" people are functionally different from "able" people, and the assertion of equality of capability is one underpinning of some (flawed?) ideas about breaking down prejudice (compare "Hand an armless man a spanner" with "Hand a girl a spanner", if you recall the old bumper sticker).