One consistent thread of postmodernism is to deny that human beings can possess absolute truth. This is not necessarily to say that Absolutes do not exist (although some indeed say this), but rather that our condition as human beings makes it impossible for us to grasp them. This makes a lot of people very uncomfortable and some downright angry.
Merold Westphal, in Overcoming Onto-Theology, makes the following observation about these objectors:
One does not even have to listen very closely to those who present themselves as defender of Absolute Truth or Absolute Values to hear the all too frequent follow-up: “And since We are the defenders of Absolutes, it should come as no surprise that we are the ones in possession of them. Our theories are the Truth and our practices are the Good.” One of the tasks of a theologically motivated appropriation of postmodernism is to challenge this move in all its forms, blatant and subtle. For just as I do no become purple by speaking about violets, so I do not become absolute by speaking about God. The divine character of revelation does not cancel out the human character of my attempt to say what it means. (79)