What does Botstein mean not by ' the rules of high school turn out not to be the rules of life'

When Bostein clearly stated that ' the rules of high school turn out not to be the rules of life ' he apparently meant that the social-scale in a stereotypical high school is considered fake and has no purpose whatsoever in the outside world. Meaning that appearance and athletic status will not apply or be necessary to any sort of work in the 'real world'.