It seems hard for some people to believe that actual professionals and experts will frequent places on the Internet where the subjects of their professional interest are discussed.
It's an odd phenomenon, that people seem to think some kind of real world distinction exists geographically between professionals and laypeople. Someone I know was confronted with stark disbelief when recounting their tale of running into Orlando Bloom in Canterbury, with many people utterly disbelieving that a major movie star (this was right around the time of Pirates of the Caribbean and Lord of the Rings being major blockbusters) would be in a city in Kent. The fact he is literally
from there and his parents still lived there at the time seemed to pass many people by.
So it is here, with the utter disbelief in some quarters that you can come onto some internet forum to talk about aeronautics and spaceflight and actually talk to people who do it for a living. I do enjoy those 'get the popcorn' moments when a hoax believer asks 'and what are your qualifications, eh?' I remember in particular someone years ago asking regular Apollohoax contributor sts60 what made him such an expert in spaceflight....
In the larger sense, there is a general feeling among conspiracy theorists that no real expertise exists.
The 'anti-intellectualism' lamented by Isaac Asimov in his oft-repeated quote. My knowledge is just as good as yours and academic or professional qualifications don't mean a thing. Patently absurd when it comes to engineering, since physics has a habit of slapping you into next week if you don't actually take the time to understand it.
Even still, anyone dedicated to studying the materials with a broad interest is likely to acquire a better knowledge of the subject than one who studies only what's needed to inform the next day's "gotcha!" attempt.
I'm pretty confident that my 20+ years of entirely amateur interest in spaceflight has led me to a far sounder understanding of the subject than any hoax believer, along with a confidence that I have seen more of the actual record of at least the first two decades of spaceflight than they even know exists. And I'm also aware, unlike many HBs, that there is always still more to learn about it. There's a particular type, it seems, who genuinely believe there is some endpoint to learning.