Besides DeeDee's great recommendations, it might help your son to know that "W" is probably embarrassed by his extreme outbursts after they occur, even if he doesn't show it.
You can tell your son that "W" may be a little slower in learning how to express appropriate emotions, but he's probably working on that skill and he will get there with the help of his parents, teachers, and kids who are nice to him despite his behaviors.
And while "W" might be slower in that department, he might be really good at something else that your son could talk to him about during a non-outburst time.
What doesn't help is having someone say, "Oh, there is that *whatever* kid acting up again."
It sounds like what you have already told your son is great. He sounds like a good classmate!
