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She had a terrifically nice smile. She really did. Most people have hardly any smile at all, or a lousy one. "Ernest's father and I sometimes worry about him," she said. "We sometimes feel he's not a terribly good mixer."
"How do you mean?"
"Well. He's a very sensitive boy. He's really never been a terribly good mixer with other boys. Perhaps he takes things a little more seriously than he should at his age."
Sensitive. That killed me. That guy Morrow was about as sensitive as a goddam toilet seat. (8.9-23)
Holden knows Ernest is a jerk, but he indulges Mrs. Morrow anyway. We see in fact that he, Holden that is, is a sensitive boy. For all his sarcasm and attitude, he's careful about others' emotions.
At the end of the first act we went out with all the other jerks for a cigarette. What a deal that was. You never saw so many phonies in all your life, everybody smoking their ears off and talking about the play so that everybody could hear and know how sharp they were. Some dopey movie actor was standing near us, having a cigarette. […] He was with some gorgeous blonde, and the two of them were trying to be very blasé and all, like as if he didn't even know people were looking at him. Modest as hell. I got a big bang out of it. (17.14)
Holden is not only disgusted, but also endlessly entertained by the phoniness around him. He emphasizes the sheer absurdity of such social performing.
Then all of a sudden, she saw some jerk she knew on the other side of the lobby. Some guy in one of those very dark gray flannel suits and one of those checkered vests. Strictly Ivy League. Big deal. […] Finally, though, the jerk noticed her and came over and said hello. You should've seen the way they said hello. You'd have thought they hadn't seen each other in twenty years. […] The funny part was, they probably met each other just once, at some phony party. […] You should've seen him when old Sally asked him how he liked the play. He was the kind of a phony that have to give themselves room when they answer somebody's question. He stepped back, and stepped right on the lady's foot behind him. He probably broke every toe in her body. […] Then he and old Sally started talking about a lot of people they both knew. It was the phoniest conversation you ever heard in your life. They both kept thinking of places as fast as they could, then they'd think of somebody that lived there and mention their name. I was all set to puke when it was time to go sit down again. I really was. (17.14)
It's clear that Sally is trying to impress George in a way that Holden thinks is extremely phony. This bothers Holden especially because he believes George is a pretentious "Strictly Ivy League" guy.