They love their hair because they're not smart enough to love something more interesting.

The line reads as a cutting, adolescent-style judgment: people who fixate on appearance (here, hair) are portrayed as doing so because they lack the intelligence or curiosity to value “something more interesting.” It contrasts superficial self-regard with deeper forms of attachment—ideas, art, relationships, or inner character—and uses “hair” as a shorthand for vanity and social performance. The quote’s force comes from its bluntness and implied hierarchy of values, but it also reveals the speaker’s own insecurity and desire to distinguish themselves from peers by claiming intellectual seriousness. As a standalone aphorism, it functions more as a character voice than a balanced philosophical claim.