Jack, when other kids bite you and your mom doesn't get mad, she just says "hmmm... he probably had it coming" and the teacher says "uh, yeah, maybe this will be a lesson for him" it means you are being a jerk - a LOT.
I don't know where this kid gets the idea that everything belongs to him and that he can have anything that someone else is playing with. No one puts up with his attitude, especially not Madeline. As soon as he looks her way she gets into fighting stance and starts yelling. She takes stuff from him too, but he is constantly after whatever she happens to be playing with. The best part is that we have 17+ years to this to look forward to.