Even for bad unwanted mental stuff, I don't know if I want to call it a disease, not because it is wrong. It just sounds like you can catch it. So I only have an emotional reason to dislike it.

Depression should be renamed. I think one reason people don't understand depression is that it has a common sounding name. I mean someone can feel a bit depressed and still not have the horrific illness that is depression.

But then again, I want to rename a lot of stuff, like schizophrenia (because it means split mind), psychopathy (not a formal diagnosis but still, it only means suffering of the mind), ADHD (only focusing on attention and hyperactivity when much more is included), conduct disorder (because it sounds like just a bratty kid) and of course borderline.