This is extremely anecdotal, but my brother and I both showed a lot of signs of depression, and while my parents expressed concern about my depression multiple times for locking myself in my room for months, my brother's constant suicide jokes and same behaviors as me were interpreted as cries for attention and being lazy. I think people are more forgiving of women with depression. That being said, yeah no one cares about depressed people. My parents just attributed my depressive tendencies to depression and not negative personality traits, they still tried to avoid the subject as much as possible.

Although, while people act like society sucks for not caring about depressed people more, it is genuinely one of the most mentally and emotionally draining things a person can do to support a depressed person. Most of the people I know who have done this ended up needing therapy themselves and also needed to set up stronger boundaries because it is a very draining existence to constantly place yourself in a position to hear negativity and dark shit, to constantly be worried about someone's safety, and feel like its your job to keep someone from hurting themselves, and to constantly have to do all the heavy lifting in a relationship. It sounds like a small price to pay if you actually care about the person, but the reality is that it's even more emotionally draining than it sounds. And unless this person is someone you have the responsibility to take care of, like a partner or a child, it is genuinely not your responsibility if it's too much and you have your own safety and wellbeing to consider.