Sorry, but I don't know you are talking about. And I have suffered psychological abuse. Once even I went into a berserker state, literally "blinded by the rage". I didn't sense the hit in the front, and I have got still the scar. We were in a judgment because that incident, and I won it.
We need a debate as civilized people, because if if we make concessions too soon, others will demand more and more, until reaching ridiculous levels.
Should be cancelled "The Mask of the Red Death" because in the Victorian age there is a complete genocide in Tasmanian? What if I say I feel unconfortable, not offended but only unconfortable, with Yagno Petrovna, the dark lord of G'Henna (Ravenloft)? Or let's imagine I start about Castilla, one of the nations from the rpg "7th Sea" (now by Chaosium) and I say Castilla is showed with lots of tropes and predjudices according to the wasps' vision against Spanish empire, the supreme power in that age.
But I can't ask the censorship against all the things I dislike, can I? But I can try to explain the reasons because I am not happy with certain elements. Would you accept in a future in the setting Ixalan there was an invasion by turbant-wearer vampires? Somebody could say it is offensive for the turbant-wearers from the real life, couldn't he? Would you allow invader vampires with turbants in your game?
In the Harry Potter's saga there is "fictional racism", we have got the "pureblood", the "half-blood" and the "muggleborns" (and the main characters are one of each type). Should the franchise be boycotted because the writters said any thing? But the last videogame has sold very well, maybe because nobdy cared about that trouble.
There are bad people who hate others, but that happens even in zones where everybody is the same ethnicity, culture and religion, they will be willing to fight one against others, only because they favorite sport teams are rival, or because that nerd boy in the classroom has better grades (the syndrome of the tall poppies, hostility against the one who stands out above the rest, by his own merits, by envious and rivals).
If you really want to stop that madness, then the imposition of new taboos is not the right way, but promoting values as the good sense and the respect for the human dignity.
I am convinced the slavery and racism can be showed in the speculative fiction, even in titles for +12y, with the right and necesary respect for the victims of serious injustices in the real life.