何必向不值得的人证明什么
[hé bì xiàng bù zhí dé de rén zhèng míng shén me]
The phrase means 'why should I prove myself to someone who is not worthy'. It shows a kind of nonchalant, no-fuss attitude: focusing on self-development rather than pleasing or proving oneself to those considered irrelevant or unworthy of attention.