dysterian

Someone with terrible eating habits or preferences that are sometimes contradictory or counter-intuitive ; or resulting in bad habits, poor nutrition and poor selection of foodstuffs. Even when aware and shameful of their folly, they persist in their negative habits.

Vegetarian: "Hey lets go to that new hipster vegetarian restaurant called "Boomer's""
Dysterian: "I can't. I hate mushrooms and most other vegetables... I'd rather eat this bag of cheese crunchies."
Vegetarian " What the hell type of vegetarian are you?!"