On its 10th anniversary, Signal’s president wants to remind you that the world’s most secure communications platform is a nonprofit. It’s free. It doesn’t track you or serve you ads. It pays its engineers very well. And it’s a go-to app for hundreds of millions of people.
“Retarded” is not a slur. It’s a medical term. “Idiot” is a slur that roughly means the same thing, though not nearly as far.
“idiot”, “moron”, “cretin” and “imbecile” were all medical terms once and described different levels of intellectual disability, but they fell out of use and are now considered offensive. language changes, and context is important.