没受过伤才会嘲笑别人的疤
[méi shòu guò shāng cái huì cháo xiào bié rén de bā]
Translates into 'Those who haven’t been hurt would mock others’ scars'. It critiques people unaffected by specific sufferings or hardships judging or making light of others’ pain, suggesting sympathy, empathy towards those overcoming struggles.