1) Calling these "critics" overly careful and considerate people is one hell of a spin. I'm actually impressed. I just call them dumbasses.
2) It shouldn't matter that these are "white" women. If you wanna make tortillas, make some damn tortillas.
3) They didn't steal any recipes. They asked questions and watched the ladies make them. I don't know if you cook much, but it would be pretty damn hard to steal a recipe just by watching them cook. To insinuate they stole anything is crazy, and even if they did (they didn't, but it's a hypothetical), who cares?! A taco bus in Portland is not going to be stealing customers from a restaurant in Mexico.