Have you ever heard this, writers? (And, I mean, other than when you were a 13-year-old middle school girl who never had anything to wear and was a wreck nearly every day?)
For me, being an emotional person is not an insult or an affront. I know that, as a writer, I have an innate ability-even a talent-when it comes to accessing my emotions. I believe that this is a necessary characteristic of all writers- even business/copy writers (ie, more than just the poets).
For example, an ad writer needs to be able to understand the drive to procure Product X in order to write about Product X in such a way that the consumer feels the "right" emotion, and, therefore "consumes" the product. A newsletter writer needs to be able to access the right sense of urgency in order to get the reader to take the action warranted. Even a tech spec writer needs to be able to understand emotions such as frustration in order to know how to take a user through steps 1,2, 3 most clearly and most quickly.
Successful writers understand emotions, know how to access theirs and others, and can translate those urges into prose. So, next time you come across an over-emotional teenager, just consider them a future freelance writer!