Objective Standards for Rationality?

In relation to my last blog post on cultural relativism, I also wanted to raise a few questions for people.  I read a few articles on cultural relativism, and notions of there being objective standards to rationality across different cultures.  What is meant by this is if there are certain things that a society must up hold itself to in order to be considered rational?  I personally do not think that there are objective standards for rationality, and that there is beauty in our diversity around the world.  I would never want there to be objective standards for rationality, because this would limit the cultural freedom that people across the world have.  There is beauty to be found in this diversity, and we should celebrate it.  We should not try and place objective standards for reality upon the world, we should just rejoice in our differences and look for the beauty contained within that.