Having spent nearly 20 years as a designer and Creative Director, I can say definitively that the one constant is the cattiness of designers. "I could do that better," seems to be the tagline of the designer world, where ego is everything and the worry of being proved wrong is non-existant, because what we do is completely subjective.
Sorry to go off topic, but I love to tell people this joke:
How many designers does it take to changes a light bulb? Twelve. One designer to do it and eleven more to stand around and say, "I could have done a better job."