怎么这么任性就是这么任性
[zĕn me zhè me rèn xìng jiù shì zhè me rèn xìng]
Translated as “Why are you behaving so stubbornly/willfully? Because you are simply born arrogant/rebellious”. Such repetition adds humor or exaggeration when declaring self-determination, conveying stubbornness in personality with an emphasis: admitting one's unreasonable attitude proudly yet playfully, suggesting the user’s independent and unconstrained characteristic.