This applies in both directions though. You don't see it quite as often here as on, say, reddit, but people who don't know much about a subject, but know, say, hugely more than their friends, often think they're amazing super-expert, and when they talk to people who know vastly more than them, they can't even comprehend that. On reddit you often see it with the history of videogames. Some 20-something who has watched tons of YouTube videos on gaming history and maybe read a few wikipedia articles, will make these wild claims about games, which literally anyone who was around then and gaming with the devices/games in question knows isn't true, but he's an "expert" and another "expert" on YouTube sort of implied it was the case, so people arguing with him are dummies.
The best recent one was a guy trying to tell me that open-world games didn't exist until GTA3. He was very determined. When I and others showed unavoidable examples he started just trying to argue we'd edited Wikipedia to try and prove him wrong, and he refused to watch videos of the games in action about "YouTube can be faked" lol. Before that someone was very insisted that "CRPG" meant "Classic RPG", despite the fact that the term went back to when those game were new lol. That was pretty amazing.