Imagine this story being submitted again, only replacing every reference to disabled people with a reference to "pakis". Still funny? Still inoffensive? Bet you wouldn't post it, because taking the piss out of some minorities, like ethnic groups, is not on, whereas taking the piss out of others, disabled people, is still fair game.
Besides, this is basically a story about somebody falling out of a wheelchair, which is hardly Oscar Wilde, is it? And, since 1978, only cunts use the word "mongoloid". It displays a basic lack of education or intellect.