It belongs to the "incel" or "doomer" subcultures of the Russian web (like 2ch or Dvach), where such cynical mantras are repeated as a form of dark humor or social commentary.
This specific string is often used as a "test" or a "meme" for several reasons: tnn_zenshhiny_alcnyekorystnyezlobnye
It serves as a digital "shibboleth"—a word or phrase that identifies whether someone belongs to a specific group or speaks a specific language. It belongs to the "incel" or "doomer" subcultures