In "The Giver", when Jonas learns about colors he claims "it isn't fair that nothing has color." Why does he say this?

Jonas is just starting to realize the ramifications of his Assignment, and how the world he believed he knew is not the whole story. When The Giver explains that Jonas is seeing color and Jonas gets upset, he's realizing that it's not fair that no one else gets to see things in color because life is more beautiful in color.