> Try challenging climate science, even in a valid way, and see how popular it is on reddit or HN or twitter.
It is an attitude that is a hallmark of cranks of all forms who think they've pierced the veil, but almost inevitably they have fallen for some distorted thinking that they can't see beyond due to the limitations of being trapped in their own head and echo chamber.
I would add that logical fallacies like ad hominem are only useful up to a point. In the real world, once a group of people advance N obviously false arguments, they will lose credibility and their N+1th argument will be treated less seriously. I don't think the N+1th argument should ever be entirely ignored, but these people can't expect to be up on a podium presenting to a climatology conference if they have a long history of advancing ludicrous and/or dishonest arguments and have no deep expertise in the domain.