I am reading The Great Gatsby, and would very much like to know what "an affront to the common store of life" means in the following sentences:
He set down the receiver and came toward us, glistening slightly, to take our stiff straw hats. "Madame expects you in the salon!" he cried, needlessly indicating the direction. In this heat every extra gesture was an affront to the common store of life.
In this part, Nick and Gatsby visited Daisy and Tom Buchanan's house to lunch together. But because it was a very hot day, the butler's gesture indicating the direction seemed unnecessary.
Here, I could not grasp what was the common store of life.
Does "life" indicate all human beings? Or all creatures? Does the author have an idea that all creatures share the same store of life...? I could not understand exactly.
I would very much appreciate your help. :)