Its use has been criticized because it is seen as insulting. Maybe, but its use is not fallacious if you explain why the woo belief is a woo belief. Irrational beliefs based on magical thinking should be ridiculed. Alternative terms such as “believer” don’t really cut it, in my view.
~ Science is what you know. Philosophy is what you don't know. ~ Bertrand Russell ~ ~ Vaccine refusal is to infectious disease as smoking is to lung cancer, only twice as much! ~ Orac ~