I gave a vegan relative a gift bag with some spirits and specialist beers in - asked the shop if the beers were run through a fish bladder to refine them. Nope, all good.
Just had a furious text from said relative saying they'd drunk a beer and then checked the can and it contains lactose. Now, I feel that it's up to them to check the label. It would never occur to me that beer could contain lactose so didn't ask the shop, and as a vegetarian I always take responsibility to check labels myself. If I don't, that's on me. I certainly wouldn't contact a gift giver to complain about thoughtlessness! AIBU?