brash Krugman?

Thomas Friedman, David Brooks and Paul Krugman are my three most favorite NY Times columnists and they constantly appear on TV to discuss about economic and social issues. However, I start to feel Paul Krugman is too arrogant since he starts to level criticism against both Friedman and Brooks. Though Paul Krugman has won the Nobel prize in Economics, it should be more appropriate for him to say "I don't tend to agree with them" rather than "They are totally wrong"