Hmm. Maybe? I don't think that's quite it, either—or at least, that aspect of it doesn't bother me as much. If this type of geek thinks that they're really good in some area that they have no knowledge of, that's silly, but what bothers me more is the assumption that the people who are experts don't know anything. They're related, definitely. But I object more to the tearing-other-people-down, rather than the building-themselves-up.
Like the users above who assume that the author, a PhD candidate in neuroscience, is unaware of the difference between mean and median. Did they explicitly mention which they meant? No, of course not—it's clear from the context which was meant, and to explicitly spell it out would be insulting to the readers. Yet we have readers here who take that omission to mean that the author doesn't even understand the difference.
I see it all the time when a person writes about a problem in their field, and then armchair quarterbacks here confidently state their 5 minutes of thought about it as if it were a novel idea. So sure, there's some Dunning-Kruger in there, but there's also a corresponding assumption that author didn't think of the solutions you get from 5 minutes of thought about the problem. "Why didn't they just consider X!" Well duh—of course they did, because that's obvious.
Like the users above who assume that the author, a PhD candidate in neuroscience, is unaware of the difference between mean and median. Did they explicitly mention which they meant? No, of course not—it's clear from the context which was meant, and to explicitly spell it out would be insulting to the readers. Yet we have readers here who take that omission to mean that the author doesn't even understand the difference.
I see it all the time when a person writes about a problem in their field, and then armchair quarterbacks here confidently state their 5 minutes of thought about it as if it were a novel idea. So sure, there's some Dunning-Kruger in there, but there's also a corresponding assumption that author didn't think of the solutions you get from 5 minutes of thought about the problem. "Why didn't they just consider X!" Well duh—of course they did, because that's obvious.