edit: Thank you for editing your comment.
edit: Thank you for editing your comment.
Putting colloquial use aside, both are valid words that describe conditions, so if one is a slur, isn't the other? Where is the line?
Retard in its noun form literally means a mentally handicapped person. So by using it to offend a non-mentally handicapped person (albeit, a stupid one), you are concurrently levelling an offence against the mentally handicapped in general and since the mentally handicapped are not deemed culpable for their situation, this is deemed socially unacceptable.
Obviously the obsolete medical usage, now offensive usage, is just the regular word meaning delayed, but I think that somehow that specialized usage strayed from the generic usage over time.
What I can't make up my mind about is whether or to what extent we should approve or disapprove of the use of these words.
It's extremely strange. It is socially acceptable to criticize and make fun of the intelligence of someone with an IQ of 71, but not an IQ of 69. I can't explain it. But that's how it is.
I'd appreciate it if you'd edit your comment to reflect this.