You’re accusing me of not saying what I just said.
In any case, you’re not saying anything new or particularly interesting, bringing up Whoopi.
Her individual defence of an instance of blackface didn’t make blackface universally loved and accepted. That scenario already happened. It’s a historical event, not some theory about whether her approval has more weight than all other people involved. If you want to know why that’s wasn’t a successful defence of blackface, go read about how it wasn’t a successful defence of blackface.
You’re right. This was also the only reason people can watch Tropic Thunder, too. It’s explicitly and clearly, as the main point meant as “mockery of people who think blackface is defensible” not “basic mockery of black people”.