There are different types of bullying... unique circumstances, reasons & appropriate responses.
Some bullying is subtle... racial prejudice - not calling names, but ignoring.
Then there's singling somebody out in a crowd to tell them what's wrong with them.
Online bullying... often from moderators (which I'm glad I haven't seen on this forum)... who harrass anybody who has oppinions different from them, & they get their little clan to back them up.
Sibling bulling... is anybody with an older sibling exempt from that?
Gossiping... spreading harmful lies, that ruin social or career connections.