The milk goes through the coffee machine. If they do that they effectively need two machines (or sets of machines), one with lactose and one without. It's not simply a question of having some oat milk in stock

Yes.

If you can't drink milk, don't drink milk. Drink the coffee without the milk. Or drink water or wine or tea or whatever else they serve.
When did a lack of little luxury accommodations like these milk substitutes become intolerance?

Does stocking milk ethically require that you stock alternatives for those who want something like milk, but can't have it?

So? I'm sorry but I don't get how that's related to the discussion.

Sure, they can. It's just that there's no need to feel offended at someone asking for a milk alternative.

The French would not say that. They swear, but the religious swears are the domain of the Quebecois. Anyway, surprised the waiter even said, "non." I'm my experience more likely to say they didn't understand you and then ignore you.

serving better food than you ordered.

Lmao, the animal cruelty brain washing is real. Oat milk is just better in every single way in coffee.