>but he said nigger!!!
There are quite a few SCOTUS cases relevant here.
1) Watts v US - True Threat - Watts Factors: Context of Statement, Conditional Nature of the 'Threat', Reaction of intended Recipients (his twitter / stream fans, not niggers obviously, espec ially not the one who doxxed him, found him, and violently assaulted him)
2) Chaplinsky v. New Hampshire
3) Tam v Mattal - SCOTUS affirmed further the US government can not apply negative inference to words because somebody MIGHT view it negatively. So unless the person saying nigger (or cracker in the flip) was being physically aggressive - or - using actual fighting words, it's 100% protected speech.
4) Brandenberg v Ohio
5) Brown v. Louisiana 1966
(this isn't all, but it's a number of relevant ones: Heckler's do not get a Veto, True Trheat, Viewpoint discrimination,
Gonna be a case that is likely decided by the number of nigger riots, like George Floyd's suicide.