So I have been at this for almost 20 years and I know that most stereotypes (right or wrong) exist because there is some truth to them.
Here are a couple to start off the conversation. I hate it when everyone thinks that all sales people are hardcore alcoholics and lazy fucks that spend all their time just talking... I for obe don't drink and feel that I outwork 80% of the folks in my company - not to mention that we get to live with a target on our head all the damn time.
Another is one is golf thing... I love the sport but couldn't save my life if it depended on it... I make for a fun caddy at best. I have never golfed or been asked to golf with customers and the stereotype that we spend our time on the gold course smoking cigars just drives me nuts.
So have it - good or bad - what stereotypes irritate you and or the ones that you actually find 100% spot on and relate to.