I don’t understand the problem with changing the race of a fictional character. The race was made up to begin with.
This is true, but sometimes a person’s emotions can be invested in even the appearance of a character. It is not just about race and can be about something as simple as hair color. Heck, how many people complained about Jesse Eisenberg’s portrayal of Lex Luthor, and he was also white? Saying it was just his twitchy behavior doesn’t alone account for it, I don’t believe. He didn’t look the part, and even if he’d portrayed a much more sane version, he still would be difficult to accept as Lex. Similarly, if someone were to take Storm from X-men and make her white, it would be a massive challenge to accept the change. I can’t imagine anyone would be pleased with such a change.
That said, I do not believe changes are always difficult. Like I said, I thought Billy Dee Williams was a great Harvey Dent and really would have loved to see his Two Face. While Daredevil (2003) was not a great movie, I thought Michael Clarke Duncan was amazingly well suited to play The Kingpin.
It does not automatically make one racist to be invested in consistency in a character’s appearance across different media.