It’s a very old saying, and very true.
From the front line of Afghan refugee operations: US forces provide pallets of bottled water for them. But the water is hot, (because it was in the sun) so they don’t want it. They see people putting it into refrigerators to cool it and they form a line to get some, not understanding it will take HOURS to reach room temperature, let along get chilly. As soon as they touch it, they decline to take any.
They also resort to using the bottled water to wash their feet. It’s free and there is plenty so they don’t care. They don’t consider that they are at the leading edge of the wave and that water they are dumping on their feet may run out for the people following them in the next few days.