Caught eldest, upper primary, swapping 'your Mum' insults with his younger brother (two years younger) a few days ago. They clearly have no context of the implications of the insult, given I am the mother of both.
I find this insult deeply misogynistic and unacceptable and had hoped we'd got past that type of thing, and I want to impress that on my sons. My husband thinks I'm being completely over the top and it's just a playground 'thing' and always has been.