Loremaster

A person who has extreme knowledge of lore involving video games, books, TV shows, and more. Whenever someone messes up part of a lore, the loremaster will shame the person and attempt to educate them about the lore they got incorrect. The person will simply ignore the loremaster because he/she is annoying.

Jim: "I don't like watching movies with Kyle, he's such a Loremaster whenever I say something wrong about the movie."
Mike: "I know, right? He's so annoying."