How does the conversation that takes place between Ernest Morrow´s mother and Holden on the train to New York help to expand the theme of ¨appearance v.s reality¨ in the novel?

Rudolf Schmidt, the name of the Pencey janitor. Holden lies to Mrs. Morrow, pretending that he likes Pencey and that he is good friends with Ernest.Mrs. Morrow, meanwhile, thinks that her son is 'sensitive,' an term that Holden finds laughable, but Holden continues to tell lies about Ernest - including that her son would have been elected class president, but he was too modest to accept the nomination. This tells me that reality is malleable when people do not have any context about what the truth is.