This has been studied quite a bit by sociologists. Schools in low-income areas tend to reward subordination and punish self-expression. Closed campuses, metal detectors, the start-of-class bells... the messages are clear. Schools in middle-income areas tend to nurture some more creativity, though within limits; the upper-class prep schools tend to be most academically lenient (although the students are brutal and hazing/sexual abuse are common).

So... this is mostly a middle- to upper-middle class perspective, that of people who were bred to take white-collar "creative" jobs that are no longer creative and haven't been for ~40 years, due to consolidation and geographic polarization (e.g., society no longer has demand for cutting-edge advertising firms in Duluth or even Minneapolis).