狐狸未成精纯属太年轻
[hú lí wèi chéng jīng chún shŭ tài nián qīng]
'The fox didn't become a spirit; she's simply too young.' A fox turning into a spirit is from traditional Asian folklore symbolizing wisdom and mystery. Here it humorously suggests the netizen hasn't reached their full potential (like becoming wise) because they're too young.