How do you deal with an unfunny guy?

Okay, I like this guy and a lot of my friends don't really like him because they think his jokes are too harsh and hey find him annoying, some of my guy friends do as well. I've actually noticed it. I mean he and I have the same type of personality which is this dark sarcastic humor, he just really can't use it around other people. But when he and I talk he doesn't joke like that. He'll tease me but never to the point where I'm offended. and he always smiles when we talk. ha ha that's one thing I most definitely notice =p but how can I deal with it? or at least get my friends to understand that they shouldn't dislike him for the way he is.
How do you deal with an unfunny guy?
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