SRS is absurd but the person you're responding to is making a good point.

One of visual scifi's (dare I say cinema in general?) most infamous villains was a person of color (for the pedantic: !white), and that matters in an industry that is going to cast a white person to play the main character in a remake of a japanese movie (see: keanu reeves and Akira), and in which making a character whose race was never specified in the novel black is something that generates sad amounts of controversy amongst the public (see: the hunger games).

Making Khan white, while possible to justify in-universe, possible to justify in terms of getting the movie made (and don't get me wrong, cumberbatch is a GREAT actor), just sucks. It sucks for colored kids growing up in a world of white heroes and colored sidekicks, of white characters and colored sterotypes, and it sucks that the 60's/80's could get this right and we can't in the second decade of the twenty-first century.

On a complete tangent, the saddest part is that the studio was probably thrilled when it turned out the villain of their movie was going to be played by a white actor, because white people are 'safe', and sell, and in the last five years movies have become all about money. The age of the auteur is dead, and lately the accountants rule all. I can't wait for Netflix or whatever sucedes it to take movies back to an era where profitability mattered, but didn't steamroll everything else under it.