You catch more flies with honey and other secret weapons

Flies do not like vinegar. Also, belligerence is not the same thing as proaction. Tell that to the girl at the back of the line to claim the baggage that did NOT arrive with our flights, after a long day of cancelled flights, stand-by boarding passes and delayed take-offs and landings. She, thanks to her grating, LOUD bitching (which could probably be heard from wherever our baggage was) successfully goaded the airline representative who was at the moment, very professionally helping me with my baggage, into a full-scale altercation in which Loud Girl gets so red-faced and frenzied, that she turns to all of us (who just want to get our bags delivered) and says, "WHO HERE HAS BEEN DEALING WITH THIS INCOMPETENCE ALL DAY??" And what? She wants us to all raise our hands and spend more valuable time participating in some kind of demonstration against an employee who had nothing to do with the maintenance issues of the airplane in another city which started the whole chain of events? When the airline representative finally chooses to ignore Loud Girl and can return to assisting me (exhausted and frustrated, but patient and cooperative), guess who gets a rush put on her baggage delivery? Not Loud Girl, I'll tell you that. It didn't help that all afternoon, I had to listen to Loud Girl complain to everyone who would listen as well as to her husband on her 2 way radio.

Other often underestimated social tools in a frustrating situation:

Silence works a million times more effectively than words. Ranting vs. closed lips and meaningful one-eyebrow raise...

Speaking with a low volume, yet powerful voice gets results faster than strident yelling.

Of course, as soon as all parties are removed from the frustrating situation, all parties are encouraged to go to a really noisy (so you can scream as loud as possible) bar with friends for unrestrained bitching.