Why is black washing (in movies/television) ok when white washing is considered hateful?

Recently a lot more movies and television shows that focus either on European medieval settings or earlier than that seem to have a casting call of poc to portray a character.
Its just as bad when Hollywood hire a white actor to play someone else of a different heritage. I think both are extremely stupid.
But there seems to be a double standard.
Its probably a reason why most are getting sick of Americans.
What are your thoughts ( can't wait fot Americans to say check your privilege etc, typical wouldn't know anything outside your own walls or any other countries history)
Examples:
Why is black washing (in movies/television) ok when white washing is considered hateful?
Achilles the great Greek hero of the trojan war.
Why is black washing (in movies/television) ok when white washing is considered hateful?
Genghis Khan one of the most brilliant and terrifying warlords to ever lived. (more than 10% of the east Asian population are related to him).
Why is black washing (in movies/television) ok when white washing is considered hateful?
A celtic warrior fending off the romans but apparently it was a very diverse place back then 😴😴🤕
Why is black washing (in movies/television) ok when white washing is considered hateful?
A Scotsmen playing a god of Egypt (also a spartan warrior in 300 🤨)
I love ancient Egyptian history and mythology and this is ridiculous.
Why is black washing (in movies/television) ok when white washing is considered hateful?
Mary Queen of the Scots based in the 16th century Scotland... Are you F'ing serious 🤣🤕🤥. I think race swapping is ridiculous and disrespectful to all people no matter their heritage and should stop. I know it's only portraying and acting however it crosses a boundary when the youth are being taught lies and history was some how perfect without any issues🤥. Those who fail to learn from history are doomed to repeat it.
Why is black washing (in movies/television) ok when white washing is considered hateful?
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