What would you think if you were at a celebratory lunch and a guest did the following:
- discussed whether their niece (2 weeks postpartum) might get divorced as she and her husband have not been getting on since the baby arrived
- when asked about a different recent social event, got out the receipt from that evening and complained about the small portions and cost of the wine, going through the cost of each item, including the extras for coffee modifications
- Put food from their own plate onto the plate of the guest they knew the least (without asking), insisting they could never eat that much
YABU - normal behaviour
YANBU - rude behaviour