Come on now, admit it, every once in a while shooting fish in a barrel is amusing.

"The mark of an intelligent man is the ability to entertain an idea, without accepting it."
-Aristotle

People who are well educated on topics and know the truth shouldn't have any problem with "Conspiracy theorists" unless the theorists are right.

The answer that gives me comfort is the psychological term "cognitive dissonance". When you read about it you will get the feeling that 80% of the USA population suffer from it on a daily.

you dont know why people are opposed to conspiracy theorists?

i refer you to the salem witch trials, nazi germany,the inquasition,the crusades,rwanda, and all the other places in the world in which people lead by bad ideas futher increase attrocity.

and the laughable conspiracy theories. my favorite of which is that the Earth Grows, again are just fun to find. why get angry.

The term "conspiracy theorist," like "denier" and "bigot " "crackpot" etc are just shut up terms that people use when they disagree with you and your ideas but cannot articulate on what or why they disagree with you.

The reason for the negative approach to "conspiracy theorists" is usually because one person presents a point of view or maybe even other facts that is unfamiliar to another person.

That person's view of what they perceive to be fact is challenged and the result of upsetting that person's paradigm is usually highly unsettling for them, and the reaction is often combatitive in nature, either verbally and sometimes even physically.

Of course this may depend on what theory you are discussing. Some theories are more fact-based and conclusive than others.

For instance, the lies about the Iraq War used to be called a conspiracy theory, but now it is generally accepted by the majority of Americans that there were no WMDs, at least not the WMD's that were described during the campaign to wage war ahead of Operation Iraqi Freedom.

I remember discussing the Iraq war with someone in a bar one night and that guy wanted to believe in the whole WMD story, and he physically attacked me for my "conpsiracy theorist" point of view on the WMD story being false.

This is why discussing politics, religion, history, and various sciences often led to brawls in old days.

Short answer: Ego.
People like to believe that they are right, and that others are not.
Conspiracy theorists have the uncanny ability to make connections in leaps and bounds that others cannot, would not, or dare not. However, many connections are made by coincidence rather than by hard facts.

The other thing that goes to work against conspiracy theorists are the conspirators. It's not often that a conspiracy theorist is 100% correct, and has real evidence to back up all claims, but when they do, those seeking to keep their secret or to keep their own involvement secret will use tactics to bury said theorist to silence them, either through ruining their credibility, their lively hoods, or keeping them from speaking, permanently.

There are many wild conspiracy theories out there that are laughable, because of the irrational motives they place upon said conspirators.
It's been my experience that GREED is always at the core of many theories that have a high probability of being true.

Such as Bain Capital getting their start-up funding from CIA officials running a drug ring. -And that being one of the reasons why Romney won't release his tax records.