My younger brother is being bullied, what to do?

My brother (whos slightly younger than me) told me that kids ask him if he wants to be a "redneck Asian" without a reply, they slap him on the back of his neck.

I thought it was because he was homesick and that the teachers are bad at their job and are just so far behind, but the main reason why he his always down is because everyone is negative towards him. It just slipped out of his mouth, I didn't know how to react but I kept telling him, highschools gonna be great. I don't even know if the kids know what theyre doing, but it just makes me so mad that kids can be so sick.

My family and I are in a new area and so we go to new schools in the south. The kids at my brothers middle school are just rude and do not care. Other families new to this region have even thought of these kids as disrespectful & careless. Most of the kids are rude and mannerless all throughout the school day, and don't even try in school.

According to everyone and statistics on websites, the schools in my town are supposed to have the smartest and nicest people in the region. I can see that with my highschool, but I don't know what happened to that batch of kids in my brothers middle school.

So back to my brother, though he is not diagnosed, the poor guy is already depressed from leaving his greatest friends and he's a shy and reserved type of person, so it's hard for him to make friends. He's always got the saddest, mopy looking face. The only time I see him happy is when he's texting his friends.