没受过伤就别笑别人的疤
[méi shòu guò shāng jiù bié xiào bié rén de bā]
The name translates to 'If you haven't been hurt, don’t laugh at others’ scars.' It signifies empathy towards others, indicating an understanding that only those who've experienced hardship can fully appreciate others’ pain, so it’s insensitive to mock them.