IMO. That's a rather fuzzy boundary.
1. When we have a paragraph describing a creature in an RPG, who decides how much of that paragraph must align to RW bigoted stereotyping before it's 'problematic'? Is it one sentence, one word, half the paragraph?
That depends on the sentence, worrd or paragraph, now doesn’t it?
Simply calling a group “savages” wouldn’t be sufficient. But start adding “brutish”, “dark-skinned”, “lazy”, “fecund” and the like, and the problem quickly comes into focus.
OTOH, use of a RW single-word slur would be questionable on its face.
(Context matters, of course: using such language when illustrating this is a holdover of prior bigotry- say, in a Shadorun or RIFTS type setting might be permissible, if ill-advised.)
2. Most negative language has been used at some point to describe specific groups of people, especially if we go back in history far enough. How far back in history do we go in our attempts to purge RW bigoted stereotyping?
I’m not sure we need to address the slurs Romans used against Celts & vice versa, but if we’re talking cultures & peoples still in existence? Yeah, we need to talk.
3. One pro to sci-fi and fantasy literature is that the worlds and peoples inhabiting those worlds don't actually exist. This allows questions to be explored like, 'how would things be if there really was biological essentialism'. 'how would things be if certain biological species were actually 100% evil'. 'what if the evil of certain races wasn't just an offensive negative stereotype but actually real and true'
Perhaps, you would find more agreement if you worked on showing that the principles driving the changes weren't as broad and sweeping as some imagine?
Funny you should mention sci-fi.
In another thread on this board on this topic, several posters (myself included) pointed out how most sci-fi writers of the past 50+ years have successfully avoided using the language of RW bigotry, even when writing about topics like bigotry.
Edit: my last paragraph disappeared while posting; I edited it back in.