Generation Y, aka the millennials, now make up the largest cohort in the workforce, and the people hiring them — and marketing to them — have plenty of preconceived notions about them. But no generation is a monolithic block, and trying to fit all of them into the same pigeonhole does everyone an expensive and often demoralizing disservice, whether it is “cynical” Gen Xers or “tech-averse” members of the Silent Generation. Jessica Kriegel works at Oracle as an organization and talent development consultant, and her new book dissecting this issue is Unfairly Labeled: How Your Workplace Can Benefit from Ditching Generational Stereotypes. She recently appeared on the Knowledge at Wharton Show on Sirius XM channel 111 to talk about why it’s so important for businesses and managers to avoid stereotypes.  An edited transcript of the conversation appears below. Knowledge at Wharton: How do we break down millennial stereotypes?…