I'm all for avoiding demeaning labels, as in the case of "mentally retarded" becoming "intellectually challenged". The original word became so polarizing and demeaning that some people were using it as nothing more than slander against people of normal intelligence. "Retard" definitely needed to be retired as a description of the mentally challenged.
But I agree with you, @Cageybird, that it all got out of hand. "Differently abled" came out as a way to level the playing field or to help institutions become more inclusive. In reality, it had almost the opposite effect. Because the politically correct name itself became a joke, anyone referred to as "differently abled" were still being viewed as outcasts. Parents and educators were the only ones still trying to use the term as intended.