90% of the time, the only people I see calling a race card on this type of thing are the people it has no impact on. It's fiction, it's a fake character. We're not bound to real-world scenarios as writers. And even if we were, why is it problematic for a person of color to have white hair? Have we never come across this IRL? If the answer is no, I do in fact find that hard to believe.
In any case, as long as you are not mocking and making fun of a stereotype or culture, then no I do not think its racist. That's what it comes down to. Don't be negative and derogatory.