As people endure abuse, sometimes it makes them stronger, but sometimes it causes them problems both emotionally and socially. It depends on the person and the type of bullying that they encounter. I think it also depends on what happens after the bullying ends. Bullying can make people tough if the victim realizes that the bullying was not their fault and the words being told to them are not true.
Bullies try to convince the victims about the lies that they are telling them. If the victims can learn how great they are and not be convinced of the bully’s words, they may become tough. Sometimes, the victim can become overconfident after encountering a bully and become the bully himself or herself toward other victims.