FWIW I would love for equality to be a right.. and to a certain extent it is.. to believe that another cultures interpretation of equality is inferior to your own is narrow minded and shows a fundamental lack of understanding..
I don’t think that’s entirely true. Maybe in an amoral world but we don’t live in one.
As a hypothetical example I would be surprised if you genuinely believe that if you have two cultures one of which believes on the whole that genocide of what they class as sub humans is a good idea, and one which doesn’t, that believing the latter is worse than the former is just a case of being narrow-minded.