You're right that Nick Cannon is the exception. (edit: actually, you're wrong: https://www.washingtontimes.com/news/2020/jul/16/nick-cannon...)
How about Ice Cube, Stephen Jackson, DeSean Jackson, Dwyane Wade, etc. and all those who supported the comments or brushed them off as "speaking their truth" or some other nonsense? They will face no consequences, because, again, racism is deemed okay in the current climate as long as it's aimed correctly.
Can you even _imagine_ the absolute chaos that would rein if a white NBA player started quoting David Duke to millions of followers, and a bunch of white NBA players and commentators supported them?