[20yrs_no_equity]

Yes. "Truther" is code word, like "birther" and "denier" and "conspiracy theorist". It basically means "anyone who doesn't agree with the Official Positions Of The Ministry of Truth, and is thus ipso facto without credibility".

It's from a very anti-intellectual ideology.

Literally these people reject the scientific method. They are rejecting argument evidence and claims based on the source, not based on the quality of the arguments (which is talking to the person not the point, and a form of fallacy of appeal to authority)