This scene is indeed much different in the book. In the film it doesn't convey the level of depravity and detachment from humanity that the book does. In the film it definitely showcases the character and displays his theme-relevant flaws but in a completely different way. The book's scene makes you pull away from the character, the movie's take on it kind of endears you to him.
Did you know the original version of the novel (the British edition) had another chapter? In it, Alex gets bored with violence and decides to rejoin society and grow up. It was cut from the American versions before 1986 (which the film was based on) because Burgess' publisher thought it would improve sales.
After reading Burgess' book in HS, me and my friend memorized the Nadsat dictionary and tried to constantly speak it using the old Warbly-Barbly poogliy divotchke yarbles-blah blah.
I wish to hell some seniors beat the shit out of us!!
All high schoolers need compulsory beatings, with the reasons clearly explained to them beforehand. The neo-hippies, the Limbaugh dittoheads, the Monty Python memorize-and-reciters, all of them, merciless beatings all around.