What's wrong with seeming like you are a recovering alcoholic? Many people are, and if someone judges you for that, they're not a good person. Many people also don't want the excess calories, and if someone judges you for NOT joining them in drinking alcohol, again, they're not a good person.
Same goes if they think you're a food/diet nazi. Who cares? It's your body. They shouldn't be so judgmental of your life choices, especially something as personal as how you decide to fuel your body and stay alive. And if they are judging you, in my experience, it's usually because they're working through their own issues and would rather it not be pointed out how unhealthy their choices are, and they want you to join them in their maybe-not-so-great decisions.
Same goes if they think you're a food/diet nazi. Who cares? It's your body. They shouldn't be so judgmental of your life choices, especially something as personal as how you decide to fuel your body and stay alive. And if they are judging you, in my experience, it's usually because they're working through their own issues and would rather it not be pointed out how unhealthy their choices are, and they want you to join them in their maybe-not-so-great decisions.