Belonging to the class of bland, clean-cut, middle-of-the-road suburbanite breeders. The Cleavers from the old TV show "Leave It To Beaver" are a familiar archetype of whitebread culture. Compare to yuppie
The term implies profound cultural naïvete, blind consumerism, and an unquestioning "follower" mindset. Common trappings of the whitebread lifestyle include golf, Kenny G and Enya CDs, SUVs, an irrational fixation on lawn care, Golden Retrievers, nominally Christian religious beliefs, Old Navy clothing, moderate to conservative political views, bad Chardonnay, equally bad espresso, cookie-cutter houses, Bath & Body Works hygiene products, and very white-collar employment.
Though whitebread individuals are usually white, the term is not necessarily racial in meaning - the implication lies more with the blandness, predictability, and banality of plain white bread. Accordingly, "wonderbread" is often used as a synonym.
I'll bet the amount of money that whitebread neighborhood spends on lawn fertilizer could feed a small African nation.