Fun Fact: While the rest of the media is calling the tweet racist, Fox is calling it "Racially charged". What do you want to bet she angles this as the "deep state" rising to suppress her free speech? Could get her show picked up on Fox where ratings will skyrocket even higher.
Comedians can say anything they want, as surely as anyone else. It is not like the state is imprisoning her for her speech. But as someone being paid by a company to produce a product, is it not that private business' right to terminate said employee for any reason they want?