Why employees don't discuss about their problems and frustrations to their management?

I've recently gone through a conversation, that one of my colleague posted this in our company group. The best answer came from a really frustrated employee was "You cannot discuss your Malaria problems with the Mosquito". That guy was really making scene😄 

I'd like to know What's the reason why most of the employees insist themselves for discussing their problems with their managers? Is that because manager won't care?