In germany Bavaria, a famous chef did write some rules on the main entrance everyone should read before entering his restaurant.
1. This is my restaurant, I own this place and I'll decide what you can choose to eat.
2. There's no extra menu for allergies/or special diets.
He'd quite the reputation and many chefs did like the way he set these rules. In interviews he explained how much he disliked the movement of a whole industry, from Butter, rich meat and flour in sauces to oil, lean cuts and starch in sauces.
He was the guy who could ensure a full house every weekend and the more guests you have, the harder it gets to react to wishes like a lactose free sauce Hollandaise, because you can't keep a Hollandaise for more than one day and you don't know how many lactose intolerant people will be coming.