My charitable interpretation of their comment is that if they were going to tell them to fuck off, it wouldn’t just be the words “fuck off”, but rather an essay-length diatribe listing their failings and personality flaws at length. Therefore a comment saying they’re not going to do that is caring less…?

Imagine a person that bears an uncanny resemblance to a specific person’s penis. Now imagine a scenario where it’s important to convey this information to the bearer of said resemblance.