Ungrateful bosses are a dime a dozen, and even more than that when you are working in customer service in retail. The turnover rate is high, employee satisfaction is low, and if you got a penny for every Karen you've crossed paths with, you would be so rich you wouldn't need a job. But life isn't all rubies and roses, or however you say it. You won't always love your job, let alone your boss. This employee had been working non-stop weekends and giving her all to her company, but it was not enou…