I don't say much in class and I don't talk to people, even the "regular" ones. I'm an introvert and frankly I just don't like most people enough to want to talk to them. Let's see, we could gossip about people, or we could talk about some sport, or uh... we could just not talk. I'll take option #3.
If you really have some desire to get to know the guy, ask him about himself or what he enjoys or likes or finds interesting or whatever. If you're just talking to him out of pity, well, that seems pretty stupid to me.
Believe it or not, just because someone is different from you doesn't mean they're somehow inferior. Not everyone likes mindless chitchat (I sure don't).
Wait, is this high school?