"First off, the very term "denier" is emotionally loaded, since the only time you commonly hear it used is in "holocaust denier.""

Actually I hear from and about climate change deniers way more often than holocaust deniers. The fact is that denial is an apt technical description for what many people do.

"Skeptical about vaccine safety? You're a kook.

Skeptical that observed global warming is made made, and might not be more related to solar activity or a natural climate cycle? You're a kook."

Or ignorant.