People don’t even have to be lying to be wrong about this stuff. Someone can learn enough about a topic to be halfway up Mt. Stupid in no time flat, and in doing so, think they not only truly understand the topic at hand, but might be particularly adept because they were such quick studies. People that know less are impressed, because why wouldn’t they be? Anybody that knows more than them sounds like an expert. And people that know what they’re talking about cringe at the overconfidence, and probably try not to engage: who wants to have to prove that someone’s boundless confidence is entirely baseless? Most of the time, they think the actual expert is full of shit because they think they’re the expert. It’s incredible how many times I’ve had people in tech confidently, even smugly “explain” design concepts and strategies to me that they did not actually understand, knowing I was an experienced, degree-holding designer… and they didn’t even have a chatbot’s lips on their ass telling them how smart and insightful they were.