Take the entire argument in the first few posts, substitute "black people" for "special people/kids" and "******" for "retarded":
"Don't say ******, it hurts black people's feelings NOT ABOUT CALLING BLACK PEOPLE NIGGERS
Basically, they have been playing this BS video on the morning announcements for the past couple days. Basically, it's saying that because a word used to refer to a group and then became and insult and no one refers to them as that anymore, it's offensive to them.
"Well, it's just like gay people not wanting gay to be an insult"
Uh, no. Gay people still refer to themselves as gay. No one calls black people niggers.
To be clear, it isn't about calling black people niggers. It's about using ****** to insult normal people.
So yeah, discuss."
Then the basic objections become clear. (pardon the admittedly extreme example, it's the most illustrative)
People are opposed to using the word "retarded" as an insult or genera descriptor because it has acquired an incredibly negative connotation (not quite on the level of "******," but still, a very distinctly negative connotation). And it still does refer exclusively to the mentally handicapped, but nobody calls them that for the same reasons nobody calls black people "niggers," gay people "faggots," Mexicans "wetbacks," etc--the term has taken on a derogatory and insulting nature. This nature of the term can't be brushed under the rug, and the history of the treatment of the mentally handicapped/special needs really until the last few decades of history can't be ignored. It's not like we're talking about the landed white male aristocracies, who have never really been subjected to any serious injustices; we're talking about a group that has been subjected to extremely unfair and hateful conditions (forced commitment in the form of basically incarceration, but without rights; forced sterilization; outright murder; etc) for much of history. While I admit the campaign against the word "retarded" does often seem a little unnecessarily overboard, the general sentiment of "don't use derogatory terms for [X group] as a general insult" is spot-on.