The reason this is so difficult to undo is because callout posts possess attributes that allow them to bubble to the top of social networks: a clueless subject

The reason this is so difficult to undo is because callout posts possess attributes that allow them to bubble to the top of social networks: a clueless subject who can be positioned as entitled, a controversy that garners a strong emotional reaction, and a reveal from a foil with a bit of additional insight. It feeds our need for drama, vengeance, and putting someone in their place, even if the mechanisms of doing so are much the same as bullying. With the Internet having a deep memory, and screenshots and reposts being photocopies, the risks of speaking off the cuff have gone up significantly.