Much of the mistreatment I receive because of my bipolar disorder comes from Christians, sadly, though to be fair, I'd say about 60% of my social circle consists of Christians.
Most of the mistreatment I receive is also unintentional. That is, the people who mistreat me are actually well-intended, and are offering what they see as legitimate input to my situation. There are a few who tell me to refuse bipolar disorder, to claim that I don't have it, as if that will somehow make it go away.
The reality of bipolar disorder, however, is that it becomes a potentially lethal problem if it is ignored. Depression kills perhaps more directly than mania, but both can cause legal, physical, and emotional damage that can be difficult or impossible to repair, given human means.
Most of what I get from the Church is that I should trust God, that God would not allow me to fall into dangerous circumstances, that God can heal me if I have enough faith. All of these things are--to a point--true, but they do not take into consideration the will of God, my own choices (and consequences), and the reality of the world.
I have gotten to the point that I will mention my bipolar disorder to Christians, but in a realistically positive light. Right now, my disorder is well-managed by medication. Any comments that I may one day be healed, be rid of medications, or other such notions tend to go in one ear and out the other, as far as I am concerned. I remain polite, but I often pay little attention to what I've heard before.
One thing that's important is to distinguish between what I cannot control, and what I can control. I am only responsible for myself, so if I face someone who adamantly insists on trying to force their view down my throat, I will become equally adamant that I will carry on as the Lord guides me, as I am the one dealing with the problem. I have had to tell a few that their belief does not measure up to reality, and so their input is not valid, but I truly try to avoid such confrontation.