I don't know if this is food dictatorship, exactly, but I used to know a girl who, when we went out to eat, would often pressure me to order fatty, unhealthy stuff. If I felt like it that day I would do so and she'd be happy and order something similar. If I wasn't hungry or just felt like a salad or something then she would also order a salad but be very resentful about it. She'd complain about how she came out to enjoy herself and take a break from her diet, etc.
I could never get her to explain to my exactly why we had to eat at the same level of "healthiness". I mean, when she was on one of her diet of the week crazes it never bothered me to eat a burger while she had her handful of celery and orange juice (because yes, I was allowed to eat unhealthy while she ate healthy, but the reverse was never allowed to happen.) We drifted apart years ago, but sometimes I think about her and wonder if she still does that.