Climate science deniers tend to be quite touchy when you call them a climate science denier, or denier for short. In my case this has even led to someone threatening to sue me for libel because I used the term climate science denier in a private email. Which wasn’t even aimed at them, I just used the term to describe the type of arguments that were being used.
The term also is quite simple in its origin, it means that you deny something. I use the term to state that climate science deniers dismiss or even flat-out deny the evidence climate scientists have found. You have similar versions of the term denier for those that reject the science behind vaccinations, AIDS, Evolution, etc.
I expect climate science deniers to not respond well when you use the term, that’s why I only use it when it’s truly earned. What I didn’t expect was that the usage of this term would lead to Dr. Roy Spencer writing the blog post ‘Time to push back against the global warming Nazis‘ (archived here):