Just because someone is depressed doesn’t necessarily mean that they’re down and sad 24/7 (this isn’t applicable to everyone with depression). They can still have good days, and if something good happens to them, they can still be happy about it. Also, this doesn’t mean that when they’re happy, they’ve gotten over their depression. Some people might be faking happiness so that others can’t tell their depressed, but just because someone is depressed doesn’t mean that they have to be sad about everything, and if they are happy about something it doesn’t mean “they’re not REALLY depressed.”
Explanation: When you tell someone you’re depressed, you might get a lot of, “Oh but aren’t you grateful for what you have? There are so many people out there who have it worse than you…” etc. etc. Being depressed doesn’t necessarily have to do with thinking that you have nothing positive in your life. Depression doesn’t always come from a constant mindset (like always thinking about the negative things in your life), but it sometimes just comes along unexpectedly. There are also numerous other things that can cause depression— it is hereditary, and can also be caused by past events, etc.
I know this probably isn’t the best description, but I hope you get what I’m trying to say :)
Depression isn’t just something you can “snap out of.” I think people find depression as some sort of personal weakness, and that people with depression just have to be more grateful or positive. They might get a lot of “your life isn’t that bad, it could be worse” speeches, but that’s not just what depression is about, and it definitely isn’t that easy to get over.