“You told me you couldn’t do X, but you just did Y. I can’t see how that makes sense. People who can’t do X didn’t ought to be able to do Y either. I’m not going to adjust for you or assist you any more, because it’s obvious you’re just a horrible person pretending to have a problem.”
Person-with-unconventional-physical-limitations (a.k.a. a disability):
“So, instead of rejoicing that my difficulties are less than you thought they were, and that you didn’t have to make the adjustments you seem so much to resent on that occasion, you accuse me of pretending because my physical limitations differ from your assumptions about how they ought to work?
“Let’s look at this logically, if rather over-simplistically. It isn’t possible for someone to do what they aren’t able to do. It is possible for someone to not do what they are able to do. The only way in which I can make my condition look as if it fits incorrect assumptions of how it ought to be is to not do things which are perfectly possible.
“Therefore, what you are saying constitutes a social requirement to malinger. If I do not pretend, I will be accused of pretending!”