Kids are teasing my son at his school, what should I encourage him to do about it?

I know this seems like a simple questions, and could possibly provoke simple one words answers, but please read on and really help me.

My son is 12, he is in 6th grade. He is a logically intelligent, but emotionally immature boy. Kids in his class pick on him, getting his goat, so to speak. He is responding by displaying short bursts of anger, generally directed at the individual who is doing the teasing at the moment. For instance, he got upset and pushed his chair back out from his desk yesterday.

I feel like my opinion, and advice is somewhat compromised because I dealt with the same issues growing up. I never mastered it then, even after I joined the Marine Corps, for many years people picked on me.

I recognized it as a boundary issue for myself, subsequently, I pushed my boundaries out a bit, as I recognized how special and important I am, as a contributing member of the human race.

I would say this revelation hit me at the age of 30. The real paradigm shift for me was looking at my life, and realizing that I had a lot going for me.

Mitigating factors: We keep him dressed in decent clothes and shoes, his hair is the normal, messed up look, he wears glasses, he is a walking encyclopedia of video games and movies.

We have identified some processing problems with mathematics, but he reads and writes at a high school level. I know this because we got him into counseling this year, where he went through an evaluation process, he has attended 5 or 6 sessions so far.

Thanks for your help and insight in advance, my jelly buddies.