My sister does this to me every so often, it leaves me speechless with anger. And we are both Christians! So I think it has more to do with attitude. She once texted me a very sanctimonious remark about how she trusted God, so was never frightened, when I was in hospital with an unknown condition, and had told her I was very scared. Fortunately, one of the chaplaincy team happened to pop in to see me soon afterwards, and said 'Of course you're scared, you'd have to be mad not to be scared!' or words to that effect, which put it into perspective.
I think sometimes people can't bear their perfect world to be disrupted by real suffering or need, so they try to blank out negative situations. Christianity can be a comfort blanket fort some people. Also, friendships do change, and not all of them survive. Theses are not excuses for your friends, just possible reasons for their insensitivity. And I agree with typicallytina, you don't need this sort of 'friendship' in your life, with everything else you've got going on.