Cult following
From EverybodyWiki Bios & Wiki
A cult following refers to a group of fans who are highly dedicated to a piece of artwork in various media, often referred to as a cult classic. A feature film, television series, book, musical artist, video game, or comic book, is said to have a cult following when it has an audience that is extremely passionate about a certain piece of art. Often the cult following of fans are the only people who see the artistic value, and merit in the creative art they admire, while outsiders talk trash, and/or hate what the cult following of fans is so passionate about.