I have always hated use of the word *retard* and years ago taught my kids that it's unacceptable. It has always bothered me that people think it's okay to use. All the new variations are equally offensive. I would be completely behind adding it to the list of unwelcome slurs as that's what it is.
“If you are the smartest person in the room, then you are in the wrong room.” — Confucius