We went to visit PILs over the weekend. On the way, we stopped at a nearby town which has a regular-and very good-artisan market. We bought a heap of food to take to PILs for a nice lunch, and DD, age 12, bought herself a piece of cake from one of the stalls. This cake has apparently been all the rage amongst local children, it has been all over local social media. It's basically a rose gold themed cake piled high with sweets and icing. £3 for a small slice but DD bought it with her own money.
We went to PILs, had lunch, DD then ate her cake. All good.
Later, as we were leaving, MIL said "thank you for bringing lunch, it was lovely" FIL then said "yes and maybe next time DD will have learned to share her cake, instead of stuffing it all herself"
I laughed it off and said "oh well, good luck getting a twelve year old girl to share anything with sugar in it" and FIL got really ratty, saying "well I'm afraid she should be made to share, I couldn't believe it when I saw her sitting there, eating that cake without offering it around"
DH at this point said "Eh, it was one slice, and she bought it herself" FIL huffed a bit and we left.
AIBU to think this is bonkers? A box of chocolates yes, but surely nobody expects to share one slice of cake? If everyone had had some, there would have been none for DD!