Butters is the most hard working of all of them. The fuck are you talking about?

When you ask for the book of the year for Christmas and grandma brings you this.

You know how obsessive fans are called stans? Well, this concept pretty much writes itself at this point. So Stan becomes a big fan of something and Cartman starts calling him a stan. Stan is utterly confused why his name is suddenly used in such a negative way. This would then ultimately lead to Stan becoming the Stan from the Eminem song, where he grows a resentment for the person he’s a fan of and sends them about angry letter. He also blames his parents for making him a stan by naming him Stan.