For Catcher in the Rye Why does Holden lie to Mrs. Morrow about her son? Does the lie have a genuine concern for her at the bottom?

This question refers to the text The Catcher in the Rye.

In chapter 8, Holden finds Mrs. Morrow on a train to New York. The two of them are riding together, and this leads Holden to engage in conversation with her. Mrs. Morrow is the mother of one of Holden's classmates, and Holden uses this to fabricate a story about her son. Holden tells her that her son is sensitive, overly humble and liked by everyone. However, this is not true. Holden lies to Mrs. Morrow in order to make a fool of her. It is unlikely that he had a genuine concern for her. Instead, Holden feels contempt for adults and he believes that they are all "phonies." The lies that Holden tells show both how unreliable he is, as well as how little he thinks of others.