Diabetes 'humor' upset husband. Am I the asshole?

I was talking with my husband about my diabetes burnout and things of that nature. I made the joke 'Well there's a reason they don't call it live-abetes!'. He got upset saying that it wasn't funny and he doesn't want me think like that (not controlling, just overall worry).

Am I the asshole and the joke was in poor taste/not funny, or just dark humor to cope?