Part of the problem with bullying is that the victim often feels that he or she cannot tell, because there’s a huge amount of shame associated with it. I was bullied constantly throughout school (I moved a lot, usually to a place where people spoke differently, I had weight issues, I wore glasses, I was a “smart kid”). The first time I was bullied, I told my teacher just like I was supposed to - and promptly got in trouble for tattling. When I asked at home what tattling was, because I didn’t know the word, I was told to always listen to my teacher. This was in kindergarten.
So, I never bothered telling anyone about being bullied.

And it continued until I graduated from high school. I’m not sure what they teach now, but when I was in school “sticks and stones can break my bones but words can never hurt me” was BIG. It’s also a big pile of doggy do. Words can and do hurt. Perpetuating that message just makes sensitive children feel like there’s something wrong with them because they are hurt when other people try to hurt them, and that’s crazy.
I think as parents we need to teach our children how to cope in a healthy way. Telling a child to “toughen up” or “ignore it” or “just get over it” just perpetuates the shame that children feel without giving them a way to handle it. There is nothing wrong with having a sensitive personality - it just has its challenges (in addition to its benefits, which I think are often ignored). Learning positive coping behavior while young is essential - a lot of addictions start as coping behaviors, and a lot of people develop codependent traits to try and please the people who continually hurt them because they don’t see any other way to live.
Of course, this doesn’t ignore reporting the behavior and trying to make it stop, because a person who gets away with bullying will continue to do it. I know lots of adult bullies - though thankfully I’m better prepared to deal with them now than I was in my childhood.

But we can’t control what other people say or do, so we need to encourage our children to develop healthy ways of managing that pain when others try to inflict it on them. And of course, if the environment is toxic and proper authorities (teachers, principals, etc.) don’t respond, you remove your child from that environment. That’s not weak or “losing” - it’s refusing to allow your child to remain in an abusive environment.