Kids also should be taught not to be afraid to tell an adult if they are being bullied, and adults need to take it more seriously than they do.
I've posted this before...
At one point in HS, youngest DD was being bullied by a small group of other students.
We had no clue, until one night she came to us and said she couldn't take it anymore. We asked her why she didn't come to us sooner, and she answered that she thought she could handle it on her own (she's always been very independent that way).
She showed us a text she had just gotten from a boy at school. I won't go into details, but, I was on-fire ed off, to say the least.
I asked her for her phone and texted the little d-bag back. It went something like this...
"This is Sarah's father. I know who you are and I know where you live (and I did). If anything like this, on her phone, at school, etc., ever happens again I will take action. I will go to the school, the police, your parents...or whatever else it might take...use your imagination...
Pass this on to your little buddies as well.
If I don't know who they all are, I can find out.
And, if you think this is just Sarah pretending she's me, just give it another shot, sport."
Not the way many would have handled it, but, it worked.
She never had another problem with those pigs from that day forward.