'Ghosting' is one of the most petty things imaginable. Sorry to say I judge a person's character so much by this. It's understandable that someone may not want to break up with their partner, but simply not responding is still terrible behaviour. I'd rather be yelled at than ghosted, at least it's candour.

Summon the courage and civility to find a few empathetic words and that's that.

It's odd that we teach 'knowledge' and even 'morality' in school but not 'basic manners'. I can imagine a room of teenagers laughing out loud at someone trying to teach them how to be civil and polite, and it probably wouldn't change them, however, I think that a few years later it would start to click in. As if they were 'lessons for later, when you're not an irreverent teenager'. They would at least have choices and options for human engagement, it's a form of knowledge.