Today's job environment is tough, and if you've been unemployed for a while, you might be bitter. It's understandable, and even expected. Yet, being bitter is not a trait a prospective employer likes in a job candidate. When asked, "why are you looking for a new job," never say "my boss is stupid," or "I hate dealing with customers." Instead, try to spin the positive. Say you're looking for new challenges, or you can't go any farther with your current employer [source: Goulet].
Leave the bitterness for your buddies at the bar.