Honestly regardless of his role, who cares how he's depicted in fictional media? Was Abraham Lincoln an actual vampire hunter? No, but I still enjoyed the movie. They didn't depict the Spartans as being into little boys (and yet they did bring up that the Greeks were, so why the selectivity?), and they also depicted the Persians who were far more technologically advanced in a very bizarre and obviously historically inaccurate fashion; Of course when you bring this up they'll cry 'artistic liberties', which they won't tolerate any of with Yasuke.

Also the last samurai, shogun and Ronin, all movies with white main characters in a Japanese setting, and not a peep from these people.