From the moment you first set out to write a story for publication, you become a public figure, a celebrity. People applaud you, fawn over you, tell you how wonderfully clever you are.
Most people can see themselves writing a book someday. They relate to you. They want to be you.
But that will end quickly if you are unlikable. It will hurt your sales, too.
It doesn’t matter that you’re not presenting your book at that moment. You’re representing YOU, the writer, all the time. ALL THE TIME.