I agree that many moral and theoretical ideas historically treated as absolute were more relative than their adherents realized.

I also agree that such relative beliefs — being approximate and contextual — can be true in their own way, with different trade-offs — even as they conflict.

But I no longer believe that all truth is relative or pluralistic. Some truths transcend relativity and pluralism: to deny them in thought is wrongheaded; to defy them in practice is immoral.

We can debate where the boundary lies between the relative and the absolute.

But if you argue that no such boundary exists — why are you arguing?