Many say it is unwise to mix your everyday friends with your work friends. Why is that? Recently, a woman on Reddit shared a perfect example as to why you should. She had recently attended a gala as a +1 for her friend and had a lovely time, so she thought she should return the favor when her work threw a gala. She brought her friend as her guest, and her friend absolutely humiliated her in front of her boss. The reddit poster says that her friend grew up rich and that she didn't really have to…