He sipped his tea without slurping. When he spoke, his words were clear and enunciated, targeting his audience with crystalline precision. When he ate, his forks and knife (or metal chopsticks) did not clink noisily or unnecessarily on the plate. He bowed respectfully to his superiors and laughed at just the right pitch and volume when they cracked a joke.
Rukia didn't know whether she should have been scared or amazed. Renji really did make a wonderful gentleman when he tried.