I've had the exact oposite experience.
I drink at least half a litre of milk with my lunch, so I tend to bring my own, I am also a bit picky with what kind of milk to drink.
But I've been told several times that I should just have some of the milk supplied by the workplace.
FWIW, I think you're in the right, but I agree with others that it's best to chose your battles.
/Mats
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