What would it mean in practice to eliminate all the 'negative people' from one's life? It might be a good move to separate from a chronically carping spouse, but it is not so easy to abandon the whiny toddler, the colicky infant, or the sullen teenager. And at the workplace, while it's probably advisable to detect and terminate those who show signs of becoming mass killers, there are other annoying people who might actually have something useful to say: the financial officer who keeps worrying about the bank's subprime mortgage exposure or the auto executive who questions the company's overinvestment in SUVs and trucks. Purge everyone who 'brings you down,' and you risk being very lonely, or, what is worse, cut off from reality.
Barbara Ehrenreich, Bright-Sided: How the Relentless Promotion of Positive Thinking Has Undermined America
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