忠言逆耳谎言顺耳
[zhōng yán nì ĕr huăng yán shùn ĕr]
This nickname 'Zhong Yan Ni Er Xuan Yan Shun Er' implies 'The truthful advice is hard to hear, but flattering lies sound pleasant.' It's used to indicate someone who acknowledges the harsh reality or truth even when it's uncomfortable to face.