It's actually a prime example of where Mastodon shines and why shared blocklists have been so controversial, and why any attempt to make a common word filter would fall into chaos. There's no central authority dictating what is and isn't appropriate. I can talk about queer stuff and unabashedly gay shit on tech.lgbt without some Mastercard brainwormed tool telling me what to do. And that's great.
I tried to find an existing discussion to help get you started, but couldn't. You can start one here: https://github.com/mastodon/mastodon/issues
It's easy to sit here on Hacker News and say "they should just..." Well, there's they. Go suggest it.
Coming up with a standard filter list for an international project will be a long, noisy discussion. You'll tread on internecine conflicts you had no idea about. Old wounds from past related discussions will come out. People will soapbox. The topic of the mere inclusion of the text of the slurs in the filter list will be 500 pages of yelling.
This is why I have no interest in discussing it. It probably won't go anywhere in a place where it actually could. It definitely won't here.
Right. Not to mention the Scunthorpe Problem.