You get the impression that writer and director Burr Steers knows the territory ... but his sense of humor has yet to lose the smug self-satisfaction usually associated with the better private schools.
The real triumphs in Igby come from Philippe, who makes Oliver far more interesting than the character's lines would suggest, and Sarandon, who couldn't be better as a cruel but weirdly likable WASP matron.
Although Igby has its share of glitches and tonal inconsistencies, it packs an emotional wallop similar to that of another cultural golden oldie as beloved in its way as The Catcher in the Rye: The Graduate.
Igby is ... so irritating that people periodically feel impelled to lash out and hit him out of sheer frustration at the smugness of his baby rebellion. Audiences will likely be tempted to throw a few punches themselves.