For the record, Arab slave owners did have a tendency towards Eurocentrism:
https://academic.oup.com/book/10928/chapter-abstract/159193837White female slaves were more expensive than black ones and they were rarely used for rough labor and filled higher positions in domestic and administrative employment.
as our enemies are also happy to report:
https://www.amren.com/features/2017/02/black-slavery-middle-east/Among domestic slave women, blacks performed menial work while whites tended to be personal attendants of their owners. White slave women cost between three and ten times more than brown-skinned Abyssinian women; black slave women cost half to one-third the cost of brown slave women. [9]
So Arab slave owners were not fair either. But they way in which they were unfair was not ethnotribalist, but instead Eurocentrist.