So, according to this article bullies are kids who have high self esteem but feel shame about not living up to their own standards. I suspect these tend to be standards reinforced by parents.
https://www.psychologytoday.com/blo...201010/do-bullies-really-have-low-self-esteem
"Shame has to do with how you think about yourself, and it results from not living up to your own personal standards.... shame makes you feel as though your whole self is bad. A child might experience shame regarding certain things about himself--his appearance, friendships, performance, socio-economic status, or the behavior of family members--if he believes that they don't match up with what he thinks are "good enough" or ideal qualities."
Bullies have high self esteem and victims have low self esteem.
This article talks about building your child's self esteem to combat bullying. And it doesn't say teach them to fit in at all costs.
https://www.freefrombullies.com/articles/Article_4.pdf
"People with high self-esteem can usually shrug off bullying. They
know what the bully is trying to do and either walk away, ignore them or can quieten the bully
with a few well-chosen words."
This one talks about building confidence and self esteem in your children from birth.
https://www.pbs.org/wholechild/parents/glad.html
"You can assist your baby in feeling good about herself by recognizing the unique qualities that she possesses. It's important to pay attention to your baby's temperamental pattern so that your expectations fit her personality."
The point is, those of us who advocate letting children make decisions for themselves where possible, instead of reinforcing unhelpful and possibly dangerous cultural norms are not putting our children at risk of bullying. We're teaching our children that the opinions of bullies don't matter!
In contrast, I do fear that teaching kids to fit in at all costs may create bullies, and even victims.