Oh, and one last thing... tumblr is not a monolithic SJW* hivemind. I've seen a little bit of everything on there, including neo-Nazi blogs. You can't be sure that all of the posts you're complaining about were written by SJWs, and not by people with the exact opposite views (or just trolls, which happen on tumblr sometimes too).
I don't know about the specific posts you're complaining about. I don't know where those people were coming from. Sure, "setting an American movie in Japan and using a lot of actual Japanese actors in the cast is racist" sounds like a weird claim, but as your complaint about the "I'd rather be a rebel than be a slave" shows, you're more likely than not ignoring the context in which someone may have been saying these things.
* As much as I think that term is a strange combination of loaded and meaningless, I'll use it in this comment since it's easier than debate about the origins of the term and how it's used.
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I don't know about the specific posts you're complaining about. I don't know where those people were coming from. Sure, "setting an American movie in Japan and using a lot of actual Japanese actors in the cast is racist" sounds like a weird claim, but as your complaint about the "I'd rather be a rebel than be a slave" shows, you're more likely than not ignoring the context in which someone may have been saying these things.
* As much as I think that term is a strange combination of loaded and meaningless, I'll use it in this comment since it's easier than debate about the origins of the term and how it's used.