The fire extinguisher is empty, since years, and you know it. You are saved by people helping you extinguish the flames. They help you because you helped them, and don't remember they exist only in a moment of disaster.
Afterwards, they tell you to not foolishly press the handle on an empty fire extinguisher, in the hope it will magically extinguish the flames because it simply "has to".
You get angry because how dare they criticize a fire extinguisher.