Meta-stupidity actually has another term for it as well - the Dunning-Kruger effect - https://en.wikipedia.org/wiki/Dunning–Kruger_effect - people that are inexperienced in a topic don't know what they don't know (as you put it, meta-stupidity) and so think they're smarter than they actually are - people that are more knowledgable know how vast the topic is, so realize their knowledge is less compared to overall knowledge, even though they're better than average.
Part of why it's good to be cautious around self-proclaimed experts.