I don't think the parent was suggesting that everyone who believes in man-made global warming is a nutter. I think there is a large population in the world that believe in man-made global warming because it is trendy, not because of data; just the same, there is an equally large (if not larger) population who believe global warming either does not exist (or is not caused by man) for the same reason.
These are the "dogmatic idiots" on both sides of the issue who hold their professed "beliefs" either because it is popular to do so or taboo not to in their social surroundings. I doubt most of the general populous on either side of the issue could quote you any data on the situation, which makes their all-knowing attitude all the more irritating. Just look at Drudge, who posts stories about global warming protests next to stories about record cold temperatures. Clearly he's missing the point. But so are those that point to those cold temperatures and say, 'well, clearly this indicates climate change.' Neither is a climatologist, and both should shut up. Maybe it's just cold this year.
We should be approaching the issue of global warming from a scientific perspective, not a political one based on "beliefs". Both sides tend toward the latter.