Harry Shearer was fired as Dr Hibert by the Simpsons show, for being a honkey.
As I've posted about many times, it's always ok for non-whites to play whites, gays to play heteros, etc, etc but not the other way around.
Joan of Arc was a 17yo ginger chick, but it was ok for her to be played by a 20ish black chick and a 40ish black chick.
Ann Boylen is being played by a black chick in a BBC series that is in production.
A Netflix series has a black queen of England and we know that never happened.
Elliot Page is a trans-man but playing a CIS woman.
As always, "you can only play what you are" only seems to apply to CIS, hetero white male actors, though occasionally it applies to CIS hetero white women playing trans, and some other cases.