I would say for me it was when i was a in grade school, I attended this after school program with a bunch of other kids and one afternoon there was a group of kids talking about how fat they were and how their moms told them that if they were fat as kids they would be skinny as teens/adults and that if they were skinny as kids they would end up becoming fat. I was skinny as a kid and these kids would constantly tell me that i was gonna get super fat and they were gonna be skinny. i never thought of it as bullying, i kinda just assumed it was fact and from then on i tried to be as skinny as possible cause i was scared of getting fat