Ah, the ol' reliable of language pedagogy: uhhh it just sounds wrong. For any English language learners out there, "you're not even fucking human beings" is actually quite fine. "Fucking" in that case is—the classic—acting as an intensifier. "Human fucking beings" is a different use of the word "fucking".
The term that describes these occasions where a word is sort of jammed in between parts of another word or phrase ("impossible" -> "im-fucking-possible" / "United States" -> "United fucking States") is tmesis.
It's always interesting to see English language learning resources from Japan and other countries, even if they're kinda half-serious. Thanks for the translation.