I wouldn't be 100% sure that the original poster's disability is irrelevant. Ryanair has been suspected of fabricating reasons not to let people on board, based on stories I have read. Ryanair has already indicated some hostility to the disabled. Is it so incredible that Ryanair might manufacture an ID issue for a disabled person when it would not do the same for an able-bodied person? Still, it's probably not possible to prove that, so best to stick to the known facts.