I said if your lone criticism is that they changed the race of a character, you might be racist.
Obviously, if race plays into the story, there's a valid reason to be bothered. But also obviously, if you're upset that shaggy is black despite still being the stereotypical stoner type he always has been, you might need to think about why you're upset.
The former logic should not be a sweeping ban on the latter from ever happening.