Added to Urban Dictionary and accepted -
What happens when a bunch of quacks call other quacks quacks. The noise that results from a bunch of charlatans, delusionals, new agers or alt.medicine folks labelling others of the same ilk frauds and confidence tricksters, unlike themselves because they are the genuine and guaranteed real thing.
Feel free to vote it up and add derivative words. I think it deserves to become part of the vernacular.