What do you mean "appropriate" and "even for the sake of historical accuracy"?
When that woman says "Allowing a barbarian to cross the threshold of this sacred mansion is utterly unbelievable!" It is just there to dress the portrait of the attendants surrounding Mirza. Instead considring the reader an idiot, and telling us directly in a speach bubble: "The people surrounding Mirza where ignorant, xenophobic and self-righteous." The author cleverly chose to add that scene so we can deduce that ourselves, because the author believes we have the bare minimum intelligence to know 1+1=2.
If you mean to say that actual media, be it manga, books or even movies, shouldn't contain any derogatory terms or behaviour, then how could they condemn such problematic behaviour without being able to portray them?
For example, a movie about a person of color suffering from racism at school. Would you need a narrator saying "and that child is suffering from racism at school?"
The shock of portraying those scenes live, is more impactful for people who aren't aware of those social issues, and even refuse to believe them, saying "racism doesn't exist anymore." x(
I see that that it is the best and most effective way to raise awareness.
That is expecting way too much from this crowd.
They need everything spelled out to them in the most simplest, dumbed-down way for them to be able to digest it. Trust me, it's been an ongoing battle of mine since before the great comment section banning lol
It's easier for them to cry racism than to understand what is being contextually conveyed. It's called storytelling but what they want is to be spoon fed.

its always “barbaric” when its a poc character