Earlier quoted context omitted.
What is wrong with using the word "retarded"? It means slowed down. I could understand your objections if jesuscript called something/someone retarded, but they explicitly wrote "But you see, Stripe isn’t retarded." I think that whether a word is offensive or not depends on the context in which it is used. About the article you linked... perhaps I'm mentally disabled, but despite its "Why Use of the R-Word Needs to S…
Here’s another article that may be helpful https://www.pacer.org/bullying/info/students-with-disabiliti...
So, there are certain... specific... groups of people with specific characteristics who are sometimes not well thought of by some other people. And there's a word to refer to this specific group of people, and it's considered a Bad Word. And then we as a society come up with a new word for these people, which is now a Good Word. But in a couple of years, it starts being used as a slur (by the other people who dislike the specific people) and quickly becomes a Bad Word. This process keeps repeating ad infinitum and you're not going to solve it by successively banning each subsequent word and coming up with a new one which is now politically correct.
I don't think the words themselves are the problem here? The problem is that some people don't think well of some specific groups of people and whatever term is being used to refer to the specific group of people quickly becomes a Bad Word. And I don't think we'll solve this problem by banning the Bad Word and replacing it with the Good Word.