I went to school with Prince Charles for a while. Some of what was done to him could have been called bullying, but he handled it well and earned people’s respect by the way he did it.
I actually despise genuine bullying and as a teacher I come down on it like a tonne of bricks - but so much gets called bullying in modern schools that really isn’t.
I can't imagine anyone daring to truly "bully" the princess, especially in Japan where every student must know who she is. "Rowdy" behaviour by 8 year old boys... oh, the HugeManatee for the uber stuffy Imperial Household Agency.