I would be so upset if they did that to me, lmao. I would have a problem; like "you wait halfway through my meal to tell me this is normal crust?" It's the moral of the matter, allergies or not.
Luckily, I have no allergies, but a few of my past boyfriends and my current have allergies and preferences that I like to learn since I love to cook food, so I learn likes and dislikes and stuff.
My boyfriend is allergic to fish, which he actually likes, but is too afraid to eat because of the terrible stomach pains he gets. And that's his only allergy, so we don't have to worry about going out to eat and stuff.
Though maybe a really good home cooked meal would be a good option for you guys, that way you both get what you like and stuff. c: