Worked in a cafe part time a while ago as I have a child, was just getting back into work after mat leave and MH issues. I was on the Young side, but I've always looked about 5 years younger than I really am (recently it was assumed at a neighbour's BBQ that I was in the same class as their 12 year old DD by an attendee of the BBQ).
This cafe sold cupcakes, small family business with a teeny kitchen. We did make some dairy free cakes, nut free etc. But always stressed we could never ensure that there were not traces in the things we made as we used brand name chocolate from factories that state "may contain traces" etc. On the packaging, was not an in-kitchen issue. If you can't eat a Mars bar because it may contain traces of nuts, a cake made with Mars bars on them won't be okay for you to eat either. Had to explain that a few times.
A mother other comes in with a child about 7 or 8. She asks us if we have any dairy free AND soya free cakes as her DD was allergic to both. I calmly stated "um, no sorry, we do have dairy free cakes but they are made with soya alternatives".
This wasn't acceptable as she demanded we make her child something without either in, I replied we don't bake the cakes the owners do, we just work here out front. Bosses weren't in (bless them they were working 2nd jobs as the business was going under, love a bit of gentrification /s). Only other girl working was 16 y/o and very anxious.
Mum went on a rant about how we didn't cater for all allergies and demanded to see the allergen sheet. She then ranted about how we couldn't even ensure there wasn't contamination from dairy in ANY of our cakes.
She said "you'd understand if you had kids!" I replied that I did, and she laughed and said "sure you do".
Later had a rather charming trip advisor review about how we ("little girls") had treated her and could have hospitalised or killed her child. She also posted this on Facebook, which we wouldn't have seen had her husband, whom she had tagged in her post, not known the father of the 16 year old I worked with, joys of living in a small town.
Can laugh about it now but both of just went in the back and cried after that, we'd been told we were both losing our jobs right before Christmas as they were to close down and she was very irate and nasty, was a bit much at the time. Her daughter had looked mortified the whole time and kept reassuring her mum she didn't even want a cake anymore!
Also had a lady complain because we wouldn't kick out the man with rather severe learning difficulties who was "staring at her" and making her uncomfortable. He was not, he stared into space as he was partially blind, and his carer took him there every other day and he had never been any trouble. Also left a bad review for us.
Another amusing review was a 1* because we didn't sell peanut butter cup cupcakes!
And people moaning about paying £1.80 for a cappuccino, even after reiterating that I as an employee did not set the prices and that the coffees were made with the same machines chain coffee stores made at a significantly lower price than they sold them for.
A few people who ate their whole meal (just paninis, chips, Jacket potatoes etc.) and wanted refunds after because they didn't enjoy it.
My friends worked at the local Starbucks, and had a man who drank his coffee, left, then came back 3 hours later to complain that it had been cold when he drank it and wanted a refund.
The entitlement of people never ceases to make me laugh!