Twitter trashes 'The Great Wall' with sarcastic #ThankYouMattDamon

Hollywood has a very well-documented problem of whitewashing its films.
Despite awareness campaigns like last year's #StarringJohnCho , these casting decisions have continued to happen — Emma Stone cast in Aloha as a part Asian/part Hawaiian character, Scarlett Johansson was cast in Ghost in the Shell as a character who has always been widely regarded as Japanese and so many more. 
And then there was the casting of Matt Damon to play the protagonist/hero in a movie where China needs to be saved from invading demons, The Great Wall.
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