I don't know if this applies to Idris Alba or not, but for many blacks in sports and entertainment, industries where they strive for money and fame, for some reason many who want that think that once they get to a certain level, racism either doesn't apply to them or affect any more or very little.
I recall Pharell tried that bullsh*t. When you are worth 80 milion, 100 million dollars you are in a whole different company of people. If you are famous everyone caters to you, even whites. You see white people begging for your autograph, you are 'loved' when you show up anywhere public. You get the false impression your fame and money has made you racism proof.
Then at some point you get a Negro wake up call and its on a higher level than us on here. Maybe you want to be James Bond as its iconic and you are too 'urban' .Maybe you are an A list, black comedian and they are trying to make you wear a dress.
Maybe you are a famous rapper on a yacht with people worth hundreds of millions or billions, high level government officials of other countries and the host publicly asks you to do one of your raps. (this really happened, I think Nas, but I'm not 100 percent sure but I definitely recall a famous rapper saying it).
You might famous people thinking you and them are so comfortable they can say 'My n*gga' to you (Jay Z and Kanye).
Anyway, you realize the racism and bigotry is just at a higher level than a white boy yelling the N bomb to you as you riding a bike in his neighborhood.
YOU CAN NEVER ESCAPE WHITE SUPREMACY.