A lot of people just don't get it, and they're afraid to try. Or they don't have the intellectual means to do so. My family is somewhat similar (although they don't really tell me to snap out of it or anything). My mother and uncle are bipolar, I have severe depression and BPD. When I try to explain BPD to my other family members in simple terms and tell them what I need from them, their eyes basically glaze over; they aren't listening.

My aunt once asked me, "Isn't there some kind of blood test they can do to find out what brain chemicals are out of whack and fix them??" This is a woman who obtained BS in Dietetics in the 80's. Sure, she didn't major in psychology or neuroscience but still...

Tl;dr: People don't get it. Sometimes they just don't have the capacity to do so. It isn't you, it's them and even though it hurts you have to ignore their lack of support.