Ds was a lovely, well mannered, controllable boy, since starting school his behaviour has definitely changed for the worse.
If I ask him to stop jumping all over my sofa he shouts "that's not fair" and the classic "i'm not your best friend" at almost everything I say to him.
This is now 75% of what comes out of his mouth. What should my response be? My usual tactic for any unwanted behaviour is asking him to stop, then telling him to stop then depending on the severity and his response would be losing toy, pudding or time out. This now results in shouting "I'm not your best friend" etc
Is this just a phase? Any advice greatly appreciated. My sense of humour on this is going out the window