What are the most popular arguments against moral universalism, rather than for relativism or nihilism?
I'm asking in case deontology is the only viable universalist ethics, because deontology seems anathema to human happiness. I don't mean that in any Nietzschean way (though I'm interested in what he has to say about Kant and universalism): the mixture of repugnant and trivial conclusions seem hugely counter-intuitive for anyone to perform.