That's a meaningless statement. Bigots of the past all felt their personal prejudices were absolutely relevant, and didn't find the discrimination they practiced at all irrelevant or abhorrent.
Society made progress only because people fought against that. They were all accused of fighting against nature, but over time, more people realized those old standards weren't as "natural" as they were once thought to be.
Do you imagine we've reached the pinnacle of human social evolution and tolerance? Perhaps we still have similar lessons to learn, and people of the future will consider our behavior as abhorrent as we consider the 1800s.
