Only boys are bullies. Most bullies are boys, but girls can also be bullies. People who complain about bullies are babies. People who complain about bullies are standing up for their right not to be bullied. They're more grown-up than bullies are.
Bullying is a normal part of growing up.
If you think bullying is normal, you're less likely to say or do anything about it. Getting teased, picked on, pushed around, threatened, harassed, insulted, hurt, or abused is not normal. Bullies will go away if you ignore them. Some bullies may go away. But others will get angry and keep bullying until they get a reaction.