What is etiquette?

When he got closer, Tang Hao could see clearly that the collar of the Taoist in front of him was embroidered with five-color silver edges, while the collar of the crazy Taoist was embroidered with nine-color gold edges. He didn't know what the difference was. "No, no, Taoist Kuangfeng is indeed getting younger and younger. He is not like an old man like me, who might die any day." "Haha, Brother Zhou is too modest. Apart from anything else, Brother Zhou can definitely live for a thousand years."...