I don't know what you mean by "not discussed on twitter." That's where it happened. There were follow up posts, including explanations of who and what goaded that particular output stream for Grok. There was also an incessant stream of memes by people making fun of Grok, Elon, and X (all of it allowed).

The fact that LLMs become what is projected on them, in this case from outrage over a leftist saying how glad she was that white children died in a flood, was twisted to fit a narrative by the media. It was not suppressed. That woman did get her account nuked, but that was because of her own violations of the ToS.