I was having my nails done recently and was offered a coffee - lovely. They asked if I wanted milk and I said yes please. They brought the coffee to me with the milk in a separate jug and luckily I noticed the colour difference and asked what milk it was - was told it was oat milk!
Now that's probably not an issue for most people but I'm coeliac and almost all oat milks aren't safe for me including that one. Had I not noticed or had they put it straight into the coffee I'd have been very unwell. Another coeliac friend has had this happen to her when at a friend's house and was really unwell. AIBU to think if you are planning to give a milk alternative you should let people know? Nut, soy and oat milks all contain allergens (as does cow milk but at least if you have a dairy allergy you'd probably expect to ask for an alternative).
I should add, I live in a city with a comparatively high vegan population
YANBU - 'Milk' means dairy and if it's an alternative it should be specified.
YABU - If you have an allergy you should always check if someone says milk that they mean dairy.