It's easy to criticize other cultures through the lens of your own. If you're not a moral relativist, then find the best culture as your benchmark, not your own - you're not going to be magically lucky enough to live in the one morally right culture in history. Some of your own beliefs about right and wrong are going to be backwards - if you can't face up to that, stop being a cultural supremacist.
Or accept that every culture does things that look bad to outsiders and that doesn't change the fact that they may have gilded ages - no matter how good social mobility is for black people today, it's still crap for chickens.
Or accept that every culture does things that look bad to outsiders and that doesn't change the fact that they may have gilded ages - no matter how good social mobility is for black people today, it's still crap for chickens.