People believe when you can do "Anything" because that idea of empowerment is ingrained here. Somebody who questions their own skill isn't good because they don't believe it.
I'm a Hoosier, and I see it here all the time. You have to look like that it's not a problem whatsoever. Admitting ignorance on part of a given topic is seen as sheer stupidity.
It's like a job position that I interviewed for. The District manager asked a weird situational question. I don't remember the particulars, but it was something that was pretty much 0% chance of happening. I said that I would not have a clue how to handle it on paper, but I would know if it actually occurred. Their response was that "It was not the answer we were looking for".