Is Line Editing a Lost Art? Excerpt:
Manuscripts, and spirits, are often saved by line editors. Ernest Hemingway began an October 1949 letter to Charles Scribner already in a mood: “The hell with writing today.” Then he opines about editor Maxwell Perkins and the novelist Thomas Wolfe: “If Max hadn’t cut ten tons of shit out of Wolfe everybody would have known how bad it is after the first book. Instead only pros like me or people who drink wine, not labels, know.” Years earlier, Hemingway had warned Perkins about his personality: “please remember that when I am loud mouthed, bitter, rude, son of a bitching and mistrustful I am really very reasonable and have great confidence and absolute trust in you.”
MavPhil suggestion: delete the commas in the initial sentence. Read the sentence out loud both ways and you will see that I am right.
Hyphens are a source of writerly vexation. I would have written 'loud-mouthed.' Papa was probably into his cups.