Wondering whether you agree with the film's producer that it is important to separate the art from the artist.
This is a tough one for me. I agree that it's important to separate the art from the artist, but I do not want to support an artist who harbors or espouses disgusting and bigoted views.
With a movie like Ender's Game though, it's probably a bit different. There are production staff and actors and musicians and editors all involved pulling it together, and they shouldn't be made to suffer as a result of the script authors views on some other subject.
However, let's look at it in context of something where others are not involved in the same way others are involved with the creation of a film.
I would not buy a painting from a racist person who is known to advocate a return to slavery, even if the painting is well-done and of some unrelated subject matter. I would not purchase the album of a band that is known to advocate the subjugation of women and removal their right to vote, even if the rhythms and the sound were really rocking. I would not eat at the restaurant of a chef known to put live kittens in microwaves or to use puppies as golf balls, no matter how amazing the cuisine.
I do not want to support them. I want to ostracize them. I want their behavior to have consequences and be minimized in society as a result of those consequences. For that reason, I'm generally inclined not to see the movie, but my disgust is greatly softened by the knowledge that the writer is only one small component of the larger viewing experience.