The pinyin of China's idiom "pigskin talks about the past" is "G incarnation", which means to comment on superficial phenomena.

From the sequel of Lu Xun's Gai Hua Collection Navigation Newsletter: "As for Weeds, it is hard to say whether it will be done or not, and there is probably no need to do it again, so as to save people from trusting their friends and criticizing bones."

Idiom usage:

As predicate, object and attribute; Make a comment.

Example:

People who love to brag have the problem of licking their skin and judging their bones.