Or is this just how teenagers actually talk to each other now? My eldest is 29 and I don't recall anything like it when she was her sisters age but they are also very different people. My youngest is 16 (year 11) and has friends over quite regularly and honestly it feels like constant bullying? DD's response is always her laughing and even joining in by adding comments about herself? It's not like she is coming back at them with some joke about them so it's mutual it will be her laughing and adding a comment confirming it about herself? One of the friends said something about her shoes and she joined in making a comment about them and once they had gone I was saying how you desperately wanted those shoes so why are you now talking bad about them and she will just be like no I do want them obviously but it's just a joke about what they look like. It is stupid stuff like that but it feels personal, sometimes it's about DD's actual appearance or personality!
I don't know, seems quite horrible but is this really just "joking around"