Trader Joe’s made its name by offering delicious hipster-yuppie snacks like wild salmon jerky and sea-salt almonds, as well as $2-dollar wines and organic milk that won’t put your kids’ college savings at risk. But there’s another thing the privately held grocery store chain does that’s arguably better than its peppermint creme-filled chocolate wafer cookies (they’re called Candy Cane Joe-Joe’s and are irresistible): Trader Joe’s treats workers with respect and has …