But why are you glad that we moved on? Almost none of the old words were offensive in themselves. "Retarded" or "crippled" may sound offensive now, but that is completely unrelated to the etymology or meaning, it is _solely_ because it refers to something people don't want to be, so people started to use them as slurs.
It just seems so futile to have to keep coming up with new words for the same thing, when the new words will inevitably become slurs in the same way, at least if anyone uses them. So it's not like we can avoid the offence, it is just transferred to a new word. Wouldn't it be better to accept that some people will say mean things, and focus on learning to live with that, and on making people be less mean?