I really believe the author didn't have the intention to look racist. But the protagonist turning white, just doesn't sit right with me. I don't know japanese, so I have no idea the context of the scene, I thought she would have vitiligo or just "not be as black" (which I don't think it's okay in anyway, but I can kinda "get over it"), but turning her white with black hair is just.... Yeaks. At least MC doesn't seems to accept her parents after this, since she is white, which I appreciate.