当面骂醒那是友背后胡言那是狗
[dāng miàn mà xĭng nèi shì yŏu bèi hòu hú yán nèi shì gŏu]
To Be Criticized Bluntly to One’s Face - That's a Real Friend, Behind-Back Talk Is Despicable - That's a Fake Person: This conveys a belief in the value of honesty and transparency within genuine friendship while condemning those who gossip or slander behind others’ backs.