怪我蛇蝎心肠软硬不吃
[guài wŏ shé xiē xīn cháng ruăn yìng bù chī]
Refers to someone saying 'Blame me for having a heart as cruel as a snake or scorpion,' but more contextually means the person does not care about either compliments or criticisms. They maintain their stance regardless of how others may treat them.