It means that if a person says something bad, it can be said that he has no moral integrity. For example, if that person says you are xxxx, you can say that he has no moral integrity.

Give an official explanation, as an extension of the original explanation, which is often quoted by ACGN culture lovers or network communication.

It is often used in situations where the other party has made an excessive joke and the other party has said something rather ugly. What is "excessive" and "out of line" depends on the moral bottom line for the audience.

Ethics as a network vocabulary

Moral integrity generally refers to the bottom line and the lower limit; Nowadays, the term "lost in one place" is often used on the Internet to describe this person's thoughts, language and behavior as extremely obscene, reckless and bottomless.

References:

Baidu encyclopedia-moral integrity