I call them conspiracy deniers. I don't usually enjoy talking to them about this kind of stuff, but thanks for the link.
I think it's funny how some people can acknowledge one aspect of the conspiracy but not another. Like one friend actually said to me she believes in chemtrails and that 9/11 was an inside job, but she doesn't believe in any of the Illuminati or new world order stuff. But more common are the people who don't believe in the global warming myth or they recognize how extremely harmful fluoride is to plant and animal health even in small amounts, and acknowledge conspiracies like that, but they still cannot swallow conspiracies like 9/11 or that these things are all strategically being used against us.