People on twitter ask things like “How is Mann’s calling Curry a serial climate misinformer as bad or worse as Steyn referring to Mann’s fraudulent hockey stick?” Well the issue is the different norms of behavior between scientists and political commentators. In the climate wars, there is not a level mudslinging playing field for scientists and political commentators.
When I have criticized Mann, I have criticized his involvement in Hiding the Decline, and also his violations of the norms of what I regard as appropriate behavior by scientists. This is far different than what Mann has been doing in #1-#5 above. 5 years ago, defending Michael Mann against his attackers was regarded by many scientists as defending climate science. At this point, I am not seeing many climate scientists standing up for Michael Mann, owing to his violations of the norms, unless they are extreme partisans.
Related: Mann is an Island.
Note also that Steve McIntyre has found more hockey-stick problems.