It disappoints me that there are still many people who dismiss depression as being "Doctor's BS" that you can just think your way out of.
After being around such people and having similar sentiments in the past, I understand why it occurs though. This is an example told to me by someone else, who's lived through many hardships in the past, not word for word, but essentially this is the story.
Imagine this, you're a university student and you're on your own, you don't have any parents to support you, you work every holidays in order to get enough money to last the whole year, you rely on Centrelink payments, which is hardly enough to pay the rent, the bills and to fund for your food. You have a flatmate so you can actually manage to make ends meet financially, now you have to cook, clean and worry about all the finances yourself. You can't afford to take your car to the mechanic, so you buy a book and learn how to fix your car, change the oil, spark plugs...etc. all by yourself. On top of that you have to do your work for uni as well. Even though this might seem like a bleak view, many people have to live through circumstances such as these. I know of one such person. When I tell him about those going through mental illnesses, he will (of course) dismiss it as rubbish - why? Because, according to him, they have beds to sleep on, they have food to eat, they don't have to fend for themselves. In many ways, the circumstances which he has had to live through have given him the mentality that those who have good mental strength are those who will survive and those that crack under the pressure are those that have in some way or another "failed" - this is why certain people dismiss mental illnesses (such as depression) as a "rich man's illness", something that can only be afforded by the rich.
It's hard to change that mentality though, but that's just an example of why the negative view in the public exists.