Today is "Spread the Word to End the Word" day. The word I speak of? "Retard", and all of it's incantations, like "That's so retarded". I have nothing profound to say that others haven't already said, so instead I will just say one small thing: Stop saying it.
You are better, and smarter, and kinder than you are when you say that word. I know you may not mean to disparage my child, or any other person with a disability, but that's not a good enough excuse. Stop saying it all together. I did, and so should you.