I'm also diagnosed with major depressive disorder, and I've also tried to talk some friends and my ex through deep suicidal depressive episodes, and here's a thing that people should know/remember:

normal people don't know how to deal with an acquaintance who is extremely depressed. they/we are not trained therapists. you might think they are being rude and invalidating or even cruel when they say things like "you just gotta get up and shake it off and get out there and get a job/meet people/etc" but they are just trying to help and don't realise that the things they say can be damaging to a depressed person. there are things you should or shouldn't say to depressed people but you can't expect everyone to know how to deal with it. it's a tricky situation and even trained professionals say the wrong thing sometimes. your friends/workmates/family aren't psychologists