https://www.nbcnews.com/news/nbcblk/hollywood-needs-protect-black-actors-rcna50678

https://morningconsult.com/2022/09/21/lotr-house-of-dragon-racist-backlash/

I don't normally do people's homework for them but I'm gonna do it this one time, Simply Google "Black Actors and racist backlash" and you will hit the motherload of examples!!! Above are just two of the most recent ones, and nd its been happening for the last seven or eight years, and has even made its way into mainstream media awareness, so I find it hard to believe anyone in the US is unaware of this happening (unless you're not from the US in which case that's a blessing.)

Oh and one more:

https://www.buzzfeed.com/hannahmarder/backlash-bipoc-actors-white-roles