It is a truism to say that language changes, and nowhere more so than in the field of disability. When I was growing up people talked of special schools and backward, retarded or ESN (educationally sub-normal) pupils, and no-one gave a second thought to those terms. In the 19th century Earlswood hospital in Surrey was known as the Royal Earlswood Asylum for Idiots, and the term idiot was acceptable at the time (the Idiots Act became law in 1886).
Recently the politically correct term to use has been 'children with special needs', a term designed to be more acceptable than the old terms, but I have recently heard of one school which has banned pupils from using the word 'special', because it had become a term of abuse -- pupils would taunt each other with 'you're special'.
Now my son tells me that a current term of abuse among his circle is 'José Mourinho' (former Chelsea manager), or just 'José'. For instance, instead of calling someone by their name, you'd say 'Hey, José'. This is because José Mourinho's nickname is 'the special one' (an epithet he gave himself, apparently, although he presumably did not mean he had a learning disability).
That's the trouble with political correctness and trying to ban certain words and phrases -- people, especially children, are very good at thinking up something else that is equally pejorative.