In verses 22-23 of Romans 9 we find five attributes of God which He displays to reveal His own glory. They are wrath, power, patience, glory and mercy. Though people would try to repress His attributes, God makes them known, as it is His chief end to glorify Himself. You may though, how is God glorified in the mocking of a rebellious unbeliever? He is glorified in His patience toward such a one.