To be honest, your brother seems like he has no idea about what a mental illness is. It's a common issue among regular population, the misconceptions are simply overwhelming.

Your brother showed a real lack of empathy there and he sure acted unfair. You definitely shouldn't take his words as correct.

Now there are 2 sides of this though... People who don't really deal with mental illness have a hard time understanding them. You or someone in your family should probably teach him and show him what mental disorders are about in order to make him realize what you're really dealing with.
If he's not cooperating, well then, the lack of sympathy in his case would probably be a permanent issue. You'd have somehow learn how to cope with it and don't take his actions of misconceptions seriously.