Information: Bullying
Bullying happens to most people, sometime in their lives, both as children and adults.
Reason include:-Being a different shape, or race or having ability (very bright or sporty)
Having problems, like learning problems
Not being confident, and being anxious about situations
Being isolated, new at school or work, or having few friends
Being picked on for something you have done, (like being a bully)
Also the place where the bullying happens needs dealing with, such as:-
a better anti-bullying policy in the school or your workplace
more tolerance of people who are different.