I'm on disability for bipolar disorder, too, so I understand your compassion toward someone who has his own issues. From what you're saying, though, it sounds like his behavior is having more impact on you than your thoughtfulness is having on him.

I'm guessing he doesn't see himself as being the one with the problem, which means he's not going to be motivated to change. And even if he were motivated to change, he really needs professional help to do it.

It's your choice, but it would be healthier for you to find more positive people to associate with.