Not what I was talking about. What you're describing is a great way to make your co-workers hate you (or make your subordinates hate working for you if you have any and you tolerate this style of communication) while telling yourself how clever you are for figuring out how to flip the script on the system. It's not clever at all. Anyone with a brain can see what's going on when you do it, and it shouldn't be permitted just because someone managed to make their barbs in subtext, rather than explicitly peppering in words like "fuck you." Not-clever toxic passive aggression is one of the worst contributions that office culture has "given" to modern society. And it's certainly not something that makes sense for someone to recommend weaponizing against one's family...

The practicality of telling people to fuck off means saying the equivalent of, "I need you to fuck off right now [so I can take care of something important without any distractions/obstructions]," ideally having cultivated the kind of relationship where the receivers understand that importance, whether it's stated plainly or merely implied.