There's a certain wealthy area near me where restaurants ask first if you have allergies, and ice cream shops ask if dairy is ok. My wife and I always joke, "we're in that part of town."
replies(5):
In this case: "allergies and intolerances are made up stuff for weaklings, haha".
It's kind of similar to the Whole Wheat Bakery asking you whether you're OK with gluten. If you aren't, you made a big mistake walking in.
Affluent areas in general have more variety. The ice cream shop may be a place where you can get all kinds of ingredients that you wouldn't find at other places. This is 100% true for "fine dining" and it's one reason why they ask.
They will also have substitutes for an allergy to make the experience just as pleasant, thus they ask.