You don’t know what it’s like to be on the other end of that statement. That experience is something I learned myself. When I was at a point in my life when my mental health was taking its toll on me, I found myself wishing it upon others, since there was no way they could understand what I had to go through. But over the years, as my mental health improved, I've found myself at the receiving end of the same line. Of course there are ignorant people who will tell others to "choose to be happy", who truly don't understand, but having the perspective of someone who both rejected others and was rejected myself, I think that everyone should try to look at others and their views through a lens of empathy.