schizanon, (edited ) 
Finally got around to #filtering statuses on https://schizo.social and I already prefer it to the way that I've seen any other #mastodon client do it:
Firstly I hide the details entirely unless you want to see them. #Calckey blurs the #muted words which I might do too.
Then I not only display which #filter was triggered, but which words were matched.
Finally, I let the user rehide after showing in case they took a peek and then realized it was something NSFW.