I believe that people who say that actually do believe that they are helping.
Humans have trouble understanding thugs that they have not experienced and so try to compare a time in their life when they were sad and what worked and apply it to someone’s major depression.
People are not usually uncaring, they just ignorant. It’s like telling someone with a gushing bullet wound that a bandaid will fix them right up bc the last time they were bleeding from a minor cut that worked for them...

I like the “have your tried taking up yoga, going vegan, taking up knitting, etc. “ suggestions. Totally ridiculous but the giver of such advice actually thinks they are “helping”. Or how about “other people have it worse off than you do” to snap you out of your depression. Thanks, now I am still depressed and also feel guilty for it.

Anyway, people have difficulty with invisible illnesses. Humans are pretty flawed, but I still believe in the goodness of humanity and that most ppl are genuinely trying to help when they say such hurtful and unhelpful things.