Writers, by nature, are passive-aggressive, easily agitated creatures prone to taking their work too seriously. Those with the "thickest skin" (or "hide" if you're more literary-minded) have developed this imaginary armor usually through repeated bouts of public criticism and have learned to compartmentalize some of their glaring shortcomings by either a) correcting them or b) ignoring them. Both are successful tracks, usually, and those with the most impenetrable outer layers tend to develop immunity and go about their business accordingly, blissfully aware of their station in life.