He confronts the girl and asks her why he wasn't invited. She replies that if he were invited then there would not be an even number of boys and girls. Brandon then hands her something wrapped in a napkin and tells her that it is a gift. The girl opens the gift and sees that it is a cookie that Brandon saved from lunch. This to me shows that things in Suburbia are only valuable for what they cost in monetary terms.
Nothing has value even if it has sentimental value.
Dawn's clubhouse is another example of something having no value in suburbia. Class is not addressed very much in this film. From watching this movie one gets the picture that Suburbia has hidden violent tendencies, superficial families that lack love, and is not suitable for teen agers. The movie focuses on how some teenagers do not have happy lives even though they have all of their material needs fulfilled. The bottom line is that people need friends, loving parents and support from school and their peers.