If you want to do blind tests on beer snobbery, why would you choose a bunch of shitty American Lagers? If you had put in higher quality beer along side those lagers, I'm sure any seasoned craft beer drinker would know the difference. If you put a line up of different beers of a similar style, most "beer snobs" would be able to distinguish them, which ones they prefer, and most likely would be able to pick out their favorite if it was among the lineup.

I'm not sure how blind testing a bunch of cheap beer helps with your hypothesis that "Drink snobbery, whether relating to coffee, beer... has always seemed like confirmation bias in action."