Re: Keep stupid out
"It's always bunch of teenagers who *believe* they know everything."
The appropriate term I've seen is "Chuunibyou" (https://en.wikipedia.org/wiki/Ch%C5%ABniby%C5%8D ). And yes, the URL has non-ASCII characters, just to make it more humorous for this discussion.
Or if you want to spend a couple hours chasing multiple link threads, https://tvtropes.org/pmwiki/pmwiki.php/Main/Chuunibyou