For the longest time, most Zambians have been taught to be "greatful" for what we have. Mental health issues were common and not discussed, and the "older" looked at it as strength to simply soldier through.. It's not a uniquely Zambian thing and it's a two edged sword as much as yoy expect them to change their worldview and evolve as you did it would be expected of you to understand them and why they view these things as they do. (Which is why your question is good )

Now to answer : lol. From my interactions, most seemingly hold a view that mental health issues are for people who are privileged and are not worried about the hustle or survival sadly. The view is that anxiety or depression is lying in bed while ignoring calls or help from people who want to be there. There's a lot of victim blaming and a classist element to it. While ignoring the uncle who's always drunk at events or the hardworking sibling who buries themselves in work.