Autistic and retarded aren't by definition the same thing, but likely used to refer a players mental compacity and depending on the context aren't really something that should be instantly flagged for chat abuse. Telling someone to 'kill themselves' is actually, if recorded and acted upon by another person a crime - at least here in the United States it's seen as such, look into the case of Massachusetts V. Michelle Carter. If I simply type after a bad play 'that was retarded of me' or that is 'retarded amount of damage' it might not fit into a PC norm of today, but it is not anywhere nearly the same as saying to another human to end their lives because of a video game. When I was younger it was a lot more acceptable to use the word 'retard' or to call someone it, though offensive then and even more so now, the stigmatism around the word and who uses it has changed a lot, and not everyone who plays this was born past 2000. So some people might still be used to using the word to describe actions or players. Hell, I still see people calling things 'gay' and I could have sworn that died off around 2010, but it still happens and gets past the 'censors'.
Is any abusive text right to use, never, but the context cannot simply be identified nonstop and constantly censor each word you, that is yourself mind you, find offensive.