Title says it all really.
He is normally very well behaved at school and at home, but for the past week it is like he is a different child.
Not doing what he is told at home and at school, answering back, very grumpy and stroppy.
I keep asking him why is he misbehaving and not doing as he is told and his response every time is "because I don't like you"
I really don't know what approach to take to his bad behaviour.
Can I please please get some advice?