姑娘别太矫情没人在乎你
[gū niáng bié tài jiăo qíng méi rén zài hū nĭ]
Means 'girl don't be too coquettish, no one cares about you'. It suggests a straightforward and sometimes tough-minded approach against pretentious behavior, telling girls not to overdo their actions and seek attention because few people truly care.