I'm allergic to cows milk & sulphite preservatives, sulphited sugar syrups, sulphited veg, things made from them like citric acid, the bleach in teabags, gelatin, beers unless made under German purity laws, pectin, caramel colouring in whisky/brandy, cornflour, maltodextrin, malt extract. I react to it under 10ppm.
I've had family members put milk in my coffee because their too busy talking then say "ooh I didn't think you'd notice, it's only a bit you'll be ok with that", because after so many years without milk it all tastes sour to me they've grudgingly made me another.
I've had the rolled eyes from restaurants too.
It's horrible having allergies & makes me miserable if I'm honest. Anyone making them up needs to get a fucking life in my opinion.
I have a "relative" who is veggie when she's out but eats bacon & chicken at home, turkey at Christmas, duck and beef at my wedding. But, go to a restaurant & she's veggie 🙄. No one gives a shit either way.