I find this to be one of the most obnoxious and poorly argued cultural shifts of the last decade.
Sure, there are some instances that are obviously wrong, such as blackface/yellow face, Minstrel shows etc, but the concept seems to be creeping into very debatable areas.
For example, I read a criticism of a book because it told the story of a young African girl and was written by a white man. Who gives a fuck? Whether or not he pulled it off is fair game, but drawing some inane boundary that forces a white dude in his 40’s to only write about white dudes in their 40’s seems to fundamentally misunderstand the entire point of fiction. Tolkien wasn’t a fucking wizard. HG Wells wasn’t a Martian. If people can pull off writing about the experience of literal mythical creatures, I’m sure they can wrap their heads around being a different ethnicity.