The standard in the U.S. is not just saying something "awful" or "outrageous" in some vague and subjective sense, it's issuing a true threat or incitement of imminent lawless action. Ultimately that's going to be quite rare in the U.S. - perhaps precisely because other sorts of rude "outbursts" are legally okay, and because Twitter/X will issue bans for threatening or inciting violence. In the UK, the line is a lot less clear than that and people have been heavily sanctioned even for merely "offensive" online speech.
The standard in the U.S. is not just saying something "awful" or "outrageous" in some vague and subjective sense, it's issuing a true threat or incitement of imminent lawless action. Ultimately that's going to be quite rare in the U.S. - perhaps precisely because other sorts of rude "outbursts" are legally okay, and because Twitter/X will issue bans for threatening or inciting violence. In the UK, the line is a lot less clear than that and people have been heavily sanctioned even for merely "offensive" online speech.