If you're too lazy to click the link, it's a drawing of a bunch of superheroes, Batman, Superman, those sorts, colored black, with the character drawing it explaining that she is "Makin' racists angry."
Can we all agree that white people and black people look different? Much like someone with red hair looks different than someone with brown hair?
As far as I can tell, comic book people like to rage over any change, no matter how minor. Appearance is no exception. Given that white and black people look different, changing the skin color of a superhero is going to cause nerdraging, regardless of the influence of racism. It would be like randomly changing the color of their costumes.
What I'm trying to say is that not everything related to race is racist.