It's very simple. There are certain skills you need to move up in the world and writing is one of them. If you're in a corporate environment, you should also know the following:
A) Knowing how to buy a suit that fits
B) Ability to eat a meal without ruining a tie
C) Basic knowledge of architecture, literature, art, classical music or jazz.
All of this, of course, is in addition to being able to perform well in the job assigned.
Yes. Manners and culture count.
Trips to museums and family meals at the dinner table can easily help in those areas.