The existence of absolute truth is an undeniable reality. The only one I know of who tried as much as he could to live without absolute truth was Friedrich Nietzsche, and ultimately he himself failed. People who deny absolute truth only deny certain absolute truths that they personally disagree with. But when they are agreeable to a certain absolute truth, then all of a sudden they sound like fanatical fundementalists.
Take for instance the absolute truth that it is wrong to be a hypocrite. Why? After all, if hypocrisy works for them who am I to judge? If there is no absolute truth, I have no right to judge you for being what I consider a hypocrite.
How about being a self-righteous, judgemental bigot? Since there is no absolute truth, if it works for you, who is to say that that you should not be a self-righteous, judgemental bigot. Aren't I imposing my own values when I say that you have no right to be a self-righteous, judgemental bigot?
We exchanged traditional absolute truth for more politically correct absolute truth. We discard traditional absolute truth such as abstinence outside of marriage, going to church, refraining from abortion but we hold onto absolute truths such as hypocrisy is wrong, a religion that enslaves others is wrong, and judging others is wrong.
Let's be honest with ourselves. We all still believe in absolute truth. Its inescapable to believe in absolute truth. Everytime something ticks us off, we betray the fact we believe in right and wrong.