I go to a toddler group, all mums just kind of look after all kids, even disciplining each other's kids if the mum is otherwise occupied with another child/in the loo/having a chat.
My DS took a toy off another child, and as I was telling him off, the child's mum (a friend) shouted across the room, completely talking over me, telling my son off for taking the toy.
Now, if I hadn't witnessed DS doing it and hadn't been next to him ready to step in, fair enough - I would've been completely ok with her doing that. But as I was standing right there and was dealing with it, AIBU to feel undermined?