Don't tell someone to stop being sad. Like, one one hand it's okay to help by telling them they aren't a shit person, or trying to give them a reason to not be sad. But don't try to stop them feeling that way, or tell them that they shouldn't be sad or whatever. How will you overcome shit if you ignore that there's a problem? Sadness is a symptom and you need to get to the root cause and try to fix that.