That can be said about bullying that's not so severe and doesn't affect the person being bullied negatively.
Bullying can affect the mental health of some people so much that they will not be productive citizens for the society. They will have mental problems that make them feel like shit. Someone might be dealing with some other bad stuff in their life and the bullying just might be the cherry on top that makes their situation worse. And someone else might be really sensitive, and even if you 'lightly' bully them, they may not become a better citizen because of it. Just the opposite.
You can never know how it affects the person being bullied