2. Your Friend's Wretched Boss
I'm not saying it's good that your friend's boss issues last-minute mandates that pulverize your dinner plans again and again. But you can still benefit from her boss's bad behavior. Listen to your friend's specific complaints. Does it make her crazy when her boss introduces her as, "my employee" or, perhaps, "the lowly freelancer"? (It happened to me. Don't ask.) Take note so that one day, when you are in a management position, you will know to never, ever introduce the people who report to you as "my minions."