Imagine if I have 8 in the APP pattern on my freq, surrounding sector hits the line with "details" of a possible emerg diversion, I transmit "all stations standby" in reply to the first "approaching FLxxx, ABC" so I can get the info and see if we are good for it.
What if I get "standing-by ABC"..."standing-by DEF" etc etc etc?
Can I transmit "allstations, shut the **** up, I'm busy with something more important"?
When Nigel calls pan...standby or just standby we give him some silence regarding his callsign. Ditto in reverse.