I remember a study that actually said that the whole "power of positive thinking" doesn't work on people who are mentally ill. Not that it's bad to think positively or to work towards it. But telling people to think positively actually causes them to think negatively. I think telling people to smile works the same way. That's why I don't like those Ts who are all about the "happy puppy rainbows." Because if you think about happy puppy rainbows all your troubles will magically disappear.
The other one I hate is "leave it at the door." Like I can just leave my bipolarness somewhere and it won't follow me.