It's a conspiracy theory until it turns out to be an actual conspiracy. Just because they're right wing doesn't mean they're wrong. Most "normal" people in the US are pretty far to the right (and for good reasons as we can see here.)
>right-wing politicians, fundamentalist religious leaders, political commentators in mainstream print and television media, and white supremacist terrorists
Which is basically dismissing his argument by calling him a racist. Instead you should quantify how different the situation at hand is than bolshevism or marxism. This would help people who have less information one way or the other to identify the truth more easily.