Of course, anyone who mentions the word 'bomb' at an airport check-in deserves all he gets
In these post 9/11 days airports are special because they may be targets or launching pads for terrorist attacks. Airport security staff are not overpaid, nor subject to particularly high-level training. They work to a tightly-drawn set of rules and those who slip up are soon shown the door.
So when some tired or drunk or just arrogant passenger decides to treat the operative with sarcasm and scorn, the operative must, following his orders, call the cops - and that's what happens. So Mr. Smart-Ass who sneers that his baggage contains dynamite ("What do you think?" is the common riposte) will find himself face down, handcuffed, looking at the nasty end of a Heckler and Koch MP5 pointed at his ear. He will also miss his flight.
So don't even think about it. There will be no sympathy from the police or the courts. It's just too important.