When someone tells a person with severe depression to "cheer up" without realizing that depresson is that you're physicallly unable to cheer up. It pisses me off because I've met depressed people (and one of them was my aunt after giving birth to my cousin (postpartum depression exists, y'all!)) and when someone does that it just pisses them off and only makes things worse in many cases. And that pisses me off because honestly? When you provoke someone with depression things could go...well, very badly.