Why is my brother like this?

Seraphim67
In highschool, my brother was bullied by a large group of popular "cool" students physically and verbally. The group also beat him up multiple times.

The majority of the students joined in the bullying. They also beat him up multiple times.

But another group of popular "cool" students are also the people that defended my brother.

Now that my brother has finished highschool 7 years ago, my brother hates highschool popular "cool" students but he hates the average highschool students far more than the popular "cool" students that bullied him.

Today, he doesn't forgive the highschool average students that joined in the bullying against him and is extremely hostile towards them.

How can I make my brother stop hating the highschool average students? Should I stop him from hating the highschool average students?
Why is my brother like this?
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