My daughter is 10 and in year 6 of primary school.
Lots of issues around friendships which teachers are aware of.
Today the girls of year 6 were taken into a room by a teacher and spoken to about how they interacted with one another. During this speech the teacher called them all bitches, then later said that this bitching had to stop.
Aibu to think there was no need to use this terminology. The message could have been gotten across without using such language.