[gruseom]

"Conspiracy theory" is an interesting phrase. It doesn't have a meaning so much as a purpose: to shut someone up by ostracizing them and/or to shut the minds of third parties (a signal that most people reflexively obey). It's a conformist move that has a tinge of violence about it, if a phrase can be called violent.

Personally, as soon as I hear someone labeled a "conspiracy theorist" I immediately sympathize with them, though of course that doesn't make their views true.

Edit: replaced "belittling" with "ostracizing" as explained below.

[mattmaroon]

"Conspiracy theory" has a very simple meaning (http://en.wikipedia.org/wiki/Conspiracy_theory) and no derision at all. You might take it as belittling but it's not. The term "conformist" on the other hand fits your description perfectly.

[gruseom]

Come to think of it, "belittle" doesn't exactly capture what I meant, which is to mark someone as outside the zone of proper discourse. I will change the comment.

No derision at all

That's obviously not true. If it were, people would use the phrase to describe their own views sometimes.