Why are racists and anti-wokeists now offended over a black woman playing "Ariel" in the little mermaid movie?

I didn't see this uproar when white characters played everyone in the live action version of "The Last Airbender", even though the original characters were clearly not white. What happened to "keeping to the original" then? The fact is that these are just racists who might not even be aware of their own bias. White is the "norm" to them, and it's so shocking to see that being switched out. Besides, I don't know why they care so much, when this is a children's story. Something they would never even care to watch if there was no controversy. Have you seen the compilation videos of little black girls watching this? The excitement in their eyes for being represented? These racists can't realize that white people have had this representation for so long that it doesn't even seem special to them anymore.

I give Disney a lot of shit but they got it right on this one since it helped expose some people for who they really are.