Comment by Retric
Having the emotional maturity to deal with things you don’t like happening has a major influence on how tough being bullied feels like. It’s rarely much time or physical pain, but some kids obsess over it even if they aren’t the major target they often feel extremely persecuted.
Adults can watch something happening and think nothing particularly significant is going on while some kids are experiencing extreme internal distress.
The typical case of physical bullying is not just "things happening that you don't like"; it's wanton, unprovoked assault and battery. Even lesser forms of bullying generally involve some kind of unambiguous threatening, menacing or intimidation. The "emotionally mature" way of dealing with such things in any sane society is not to just walk away, but rather to acknowledge that such actions are inherently an outrage to their fellow students' basic human dignity, and demand that those responsible face meaningful consequences. The fact that "it's rarely much physical pain" (and that merely because kids are involved as opposed to adults) is completely irrelevant.