My autistic DD (13) will normally only drink milk when we are out in restaurants etc.
Some restaurants (including chain restaurants and pubs/carvery places) get a bit funny about it when she orders/asks for milk though. Even though they already have milk for the kitchen and for teas/coffees. We’ve had some restaurants outright refuse as well even though they have milk in the building.
Is it unreasonable to expect restaurants to be able to serve milk for a paying customer? Of course we pay for her milk, we are not asking for it for free!
I would say about 50% of places we go to get funny about it which I don’t understand as they already have milk in the building.