I am actually not that surprised by this. I've run into it before and it does way more harm than good. Unfortunately, these attitudes help solidify the idea that organic foods, sustainable ways of living, and local foods/resources are for a small, wealthier group of people.
Thank heavens the workers at the CSA I belong to (and my fellow members) aren't jerks. They cheerfully hand you over a paper bag* or two if you forgot your reusable bags (or need more than you brought--it gets plentiful in the height of the summer). There's no snotty attitude, just a shared joy of food and an eagerness to talk with you about how you might prepare the recipes. If they were like the jerks in the article, I'd drop out. I'd rather hang with people who know that not everyone can afford these "correct" lifestyle choices.**
*Paper bags are awesome. When I was in the first grade, I played a squirrel in a school play. We didn't have to have costumes but I made one anyway, thanks to a paper shopping bag and a box of crayons. And yes, all the other kids made them too when I showed them mine. If we had reusable shopping bags, I couldn't have been all METHOD and really, my creative impulses would have been stifled, which is CHILD ABUSE I TELL YOU CHILD ABUSE and I would have written a book about my very tough life and gone on Oprah about the difficulties of living in a world without paper bags.
**Also, purists would be horrified if they saw my pantry. My love for boxed mac 'n' cheese is epic. At the end of a week where I diligently stick to fresh kale and beets and fish and beans and whole grains (as locally sourced as I can get them), I get hit with a MAD INSANE UNSTOPPABLE CRAVING FOR BOXED MAC 'N' CHEESE, CREAM OF MUSHROOM SOUP AND TUNA MADE IN ONE POT. And I'm like, no that's disgusting don't do it EAT THE MORAL FOOD and then my ID is all DON'T YOU EVEN IT'S DELICIOUS HAVE THE BOXED STUFF YOU NEED FATS IN YOUR DIET HYDROGENATED OILS FOR THE WIN BABY and then I think Oh, no I really shouldn't hey! What am I doing stop making this dish it's disgusting and my ID is all NO YOU MEAN IT'S DELICIOUS and I eat the whole thing and basically pass out.
Purity, it backfires.