Pretentious “Know it all”

This guy(age: 22) is a know it all. He is a self-proclaimed expert who thinks he knows everything, but in reality, he just reads basic Wikipedia articles, watches YouTube videos, etc. Whenever he points something out, he’s smug about it. The know it all speaks in a condescending and arrogant manner too. His presence annoys many and undermines the comedic value of most things. People want to punch him in the face after listening to his annoying pedantry.