Yup. When my wife asked me if one of my friend doesn't eat meat for religious reasons or sth else, my answer was "I don't know" because we never had that conversation. Some people are vegetarian, some are vegan, I don't really think about asking why unless it comes up. I know some of my cousins don't eat meat because they grew up in the city and one time they visited the farms and saw how meat is made and they couldn't eat after that. But that info came from their parents, I never thought about asking, and I like it when someone doesn't ask me about my preferences too when I reject certain food.