Conspiracy theorists terminology is just way to negatively stigmatise through association any form of a different narrative that contradictions a narrative that is put forward by the government or media or authorities. By creating a negative association with the term conspiracy theorists, meaning UFO and tin foil hats and being non credible and not based on evidence. They can take perfectly reasonable argument that are backed up by evidence and the narratives that follow and exclude them before they can be heard by people. As people are much more likely to ignore or exclude information that has a negative stigmatisation associated with it. Even if they hear the information, they will process it from a perspective that will allow them to rationalise the information to avoid the social stigma associated with accepting such a label being put on to themselves.