Think the variety of vegan that is also opposed to antibiotics, vaccines, videogames, and pasteurized milk, all for the same fundamental reason: “it’s unnatural”.

Literally, its the Return to Monke ideology, but cottage-core. This tends to come with eugenics packaged with it.

I think it’s shorthand for the raw food / paleo diets that a lot of these types are popularly associated with.

I’ve heard it in the context of “cruncy granola” types of people. (disclaimer: I like granola OK!)

Crusty might be the more appropriate word.