I used to be like this guy. The only person that can help him is him - with the help of someone showing the err of his ways. Coming from a rough group of people, I still have this sense of humor but I'm not using it outright like I once did. I'm sure he has compassion to some degree, but the jokes are said without seeing their cause and effect on those who actually hear it.

Does he joke about you being BP? If so, then you may want to actually speak with him about why he does it to you and how he feels about your condition.