I couldn’t agree more (with you, not him).
Especially in light of the fact that he didn't answer the question. Which was :
“Given the disparity of these projections, why should the American taxpayer have confidence in the administration’s assurance of global calamities to come or trust your climate change education campaign?” Hall asked.
The people he "attacked" had nothing to do with his erroneous predictions. And even if the "deniers" of global climate change were wrong, the answer was not an answer. It is based upon another fallacy, that of the false dichotomy.