My ex used to tell me things like "Pretend to be happy, and you'll be happy" or the all too common "snap out of it." What was another one? Oh, I remember "just think yourself better." I really wanted to clock him for saying those things, especially if your depression is due to imbalanced brain chemistry. I mean, would you tell someone with heart problems or diabetes or any other physical problem to just "think yourself better"?
He'd even do that if I got a migraine. Say "Oh come one, it can't be THAT bad." This coming from a guy who'd never even experienced a regular headache in his life.

But, he eventually did get a headache (just a garden variety type) and was lying on the couch writhing in pain. And when I walked out on him after I couldn't take any more, he got depressed. I told him to pretend to be happy anyway. Oh, the irony. I probably should have been the better person and been sympathetic, but it was too good of an opportunity to pass up.