One of my friends is the kind that will fight for the rights of everybody. She doesn't condemn people for the sexuality, religion, etc. So, it was so frustrating last night when we got into an argument about why having Johnny Depp playing Tonto was a problem. According to her, it is "just like an American actor playing a British guy" and "it's nothing at all like blackface, blackface would be terrible!" and "Johnny Depp is a good actor, I don't see why he shouldn't get the role" and "would you be this upset if they had an Asian actor playing a Pacific Islander character" and "there were some Native American actors in the movie."
I tried explaining it to her, but we weren't in a location where I really could do a good job of it. Fortunately, I was able to keep sarcasm in check and not just go "Ah yes, all those poor, underrepresented, underemployed white male actors. It is a good thing Hollywood was able to find a role for one of them to play."
ETA: She is normally pretty intelligent and gets things like this and is willing to reexamine her ideas and prejudices, in fact she did this recently after watching the documentary about Bronies on Netflix. I'm not sure why for this issue she had such a blank spot and then argued against it rather than stopping and thinking about it.