[xxpaigiexx]

I've not personally dated someone with a disability.
Your friends should be more supportive, obviously you're a big enough person to see past the fact that he's deaf so they should be too.
If you like him and him being deaf makes no difference to you then that's all that matters, being deaf isn't funny so your friends shouldn't be making a joke of it. It might change things a little for the two of you but you like him for him which is good. It doesn't define him as a person though.
Tell your friends to grow up and get to know him a little before they pass judgement.