Tell your brother you'll see it with him on one condition--that afterward he will give you an amount of time equal to the length of the film, during which you get to refute, uninterrupted, all the lies in the movie. Then go prepared to do just that. I think it's a fair deal--you give your time, he gives his.
My brother would love to argue 10 hours straight with me about politics. But since the a priori assumptions are different, the exercise is ultimately one leading to entropy. My brother thinks that religious fundamentalists are dangerous, bigoted nutters, and that Bush is their inarticulate, alcohol brain damaged reaching out for a lift raft, low attention span, simplistic enabler. He also thinks the oppressed are not worth a dime, and we should just let them stew in their own juice.
My brother is one of my best friends by the way. And so it goes.