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I really don't understand the whole "hate," in particular on the internet, for people who eat Gluten free food. Who really cares?

The same argument can be applied to crystals, or fortune tellers, or homeopathy, or any number of other examples of more or less harmless pseudoscience adopted by the public as a result of a poor understanding of science and a weakness regarding the latest fads.

I view the gluten-free fad as just another instance of mindless herding. "A friend of mine told me their aunt's cousin's friend went gluten free and it cured their diabetes and their lazy eye!" It's simply further evidence that people, in general, aren't equipped with the harsh skepticism required to operate in a world where the internet makes it so easy for this kind of BS to spread like wildfire. Fighting these fads is a (largely futile) attempt to try and educate folks, to make them possibly a little more resilient to being duped in the future.

Of course, it rarely works out that way, which is why you're better off expending your energy in more productive pursuits.