Or am I over reacting because DD is already having a really tough time & just didn't need this upset too 
As her 12th birthday treat DD wanted a day of shopping with her best friend, including a meal in her favourite pizza place & then onto the cinema.
Sadly due to health problems, they were both too exhausted & overwhelmed by shopping in town on a Saturday - so they skipped the meal & headed home to chill out to recharge for the cinema instead (bizarrely not only do they share a less than common name, they both share the same health condition, which includes CFS & anxiety as symptoms :( )
They are both very sensible, mature 12 yr olds, who look & act older
On proudly arriving at the cinema to see a 12A film on their own, they were refused entry & told they need proof of age - nothing on the cinemas website or notice board says proof of age needed for a 12A, (only 15 & 18 - which is fair enough) SM was quite happy to take their money for over priced popcorn & drinks though, but not for cinema tickets
DD rang us, obviously upset & embarrassed to be stopped in front of a queue full of teens & preteens, but holding it together & acting maturely.
DH ran down to the cinema with her passport - that not only proved her age, but clearly showed it was her birthday - he told the staff member that it was DDs birthday & that they were both 12 & had parents permission to be there on their own.
Staff member was having none of it, refusing because he only had ID for one of the girls - DH said SM was polite & Young & he thought she might just be new & over zealous, so he didn't want to make a big fuss, but this SM refused point blank to back down no matter what DH said.
Though unfortunately DDs friend got so flustered that she accidentally gave her wrong month of birth, making her a week under 12, she corrected this, but SM refused to believe & insisted that they could only go in, if DH went in with them - At this point I would have been discretely demanding to see the manager - DH sadly didn't want to make any further fuss because the SM was polite & "sorry"
This ended up with DD running off to hide her tears as she was so upset & humiliated - on her birthday!
:(
DH ended up having to go in with them - even more annoying, as I was at home just finishing off cooking a meal for us both
AIBU in thinking this was a bloody ridiculously Jobsworth thing to do & on DH arriving with passport the SM should have just backed down & apologised & to want to make a formal complaint?
TIA