DS is four, not started school yet. Has a friend who is generally not that nice to him. All 4-yr-old stuff but it upsets him - he doesn't understand. So the other boy will call him a baby and say his toys are rubbish, play quite roughly and jump on him even though my son is saying 'no' and doesn't want to fight/play fight.
Now I know that kids are kids. But his mother dismisses it all as 'oh, he's being a boy...'. I think he's rude and my instinctive reaction is that this boy doesn't have a very nice nature. Then I think, god, this is a four year old child, don't judge. Other mothers have commented on this boy's aggressive behaviour, and I generally defend the boy as I really don't like labeling such a young child!
Am I being over-protective? Is it normal for children to behave like that? And I feel quite irritated with his mother for not picking him up on it. AIBU?