How is Holden himself guilty of being a phony in The Catcher in the Rye?

Whenmakes
plans to meet Luce at a bar, he is a phony from the start, standing up at the bar to look taller
so nobody will think he is a minor. Having done this phony thing, he remarks, deadpan:

Then, I watched the phonies for a while.

It is a comic moment.

Holden is at the bar
because he feels an urgent need to talk to Luce, a Student Advisor at his old boarding school,
Whooton, about sex, as Luce, though only a few years older than Holden, is knowledgable.
However, when Luce comes, Holden puts on a show. He doesn't tell Luce that he is still a virgin,
which of course makes an honest conversation impossible. Instead, he end up suggesting he has
had sex, saying:

So do I regard it [sex] as a
wuddayacallita physical and spiritual experience and all. I really do. But it depends on who the
hell I'm doing it with. If I'm doing it with somebody I don't even

Holden wants advice on his sex life but is unable to be open about it. This is because
he feels insecure around Luce. He even says...