From what I can tell,
S
Stinkles
was banned for employing the stereotype of the "angry black lady" in his criticism of Nina Turner. Using that stereotype to characterize his problems with Nina when she is not actually any more angry than any other average person would be unfair and "racist rhetoric" vis a vis the stereotype.
Is she more angry than your average person? I don't think so, but everyone's perception is different. Is it "angry black lady", or "strong, confident leader"?
You can judge for yourself.
Here she is talking with MSNBC because when they got mad at her calling Bloomberg an oligarch:
And here she is in a different setting, making the case for Bernie: