This is exactly what's happening, information considered objectionable is being suppressed. The correct word for that is "censorship".
You comment is kind of bending the definition of censorship. It doesn't have to come from a human being, nor does any kind of harm need to be involved. Also, my argument has nothing to do with anthropomorphising an AI, I'm certainly not claiming it has a right to "free speech" or anything ridiculous like that.
I already abhor racism, and I don't need special guidelines on an AI I use to "protect" me from potentially racist output.
“Censorship is telling a man he can't have a steak just because a baby can't chew it.” ― Mark Twain