the snowflake argument just isnt an argument that makes one sound credible.
this isnt about how someone is sitting at a game interacting with little computer pixel people. this is, by proxy, human to human interaction. Without meaning disrespect, as im sure that you didnt mean it disrespectful either, but just saying "its an 18+ game" or "GTAV also uses these slurs" is kind of hiding behind the issue at hand.
its an interaction with other people just like you and me, just with a game inbetween. and (again without implying you mean it that way) i think the least one can do is have the respect towards another individual youre sitting on the other side of virtually.
this isnt just a thing of a few snowflakes. a significant amount of people can be targeted by the usual slurs, no matter if they get hurt by them or not, and for people getting their first impression through streams or first interactions on the server, this just doesnt show a picture fo a welcome community.