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What you're gesturing at is that it's illogical to make value judgements, period, without a standard that your object of interest is being judged against. This fact, which is blatantly obvious once pointed out, is obscured by the shortcomings of our language. Usually the standard is implicit, but obvious from context, for instance if we were talking about racing, we could say that a Mclaren is better than a Volkwagen, and elide that we mean "better at moving quickly around a racetrack". It certainly makes sense to judge cultures, as long as you remember to have a standard in mind. For instance, by the standard of the general wellbeing of African Americans, it's manifestly obvious that modern American culture is superior to American culture of the 1850s. The fact that different cultures value different things shouldn't be a problem for discourse, as long as your interlocutors have values in common. Lack of objective truth about values shouldn't prevent one from working towards the values that they personally hold. Relativism isn't (or at least shouldn't be) "there's no objective truth about values, so therefore every value system should be treated as equally valid". That would be an objective normative claim, and making it would be inconsistent with relativism. Relativism is just "there's no objective truth about values", and it stops there. Nothing about that prevents you from preferring your own values to those of others. |
But it might be hard to convince a 1850s white American to adopt that standard.
It's tautological to say that as by definition 1850s white Americans culture is extremely distasteful to a modern HN commenter.
Any culture that isn't similar your culture is by definition inferior when held to your cultural standards, so there is no reason to do so.
All you need to decide is if the other culture is similar enough to tolerate it.