So true. The human race is so busy on trying to divide itself on every little thing. I'm not surprised people judge others based on what kind of video games they play.
would you consider a fan of twilight and a fan of tale of two cities to both be avid readers who can be catered to with the same style of book? the arts naturally lend themselves to a division of opinions and taste, what you want from a work and how much you think about a work. twilight can be good if you have the tastes of a 14yr old girl and no appreciation for narrative structure, but other people are not so easily entertained by it, other people want something else.
generally speaking, someone who has some concept of how an artistic medium has developed and is made, and the kind of tricks and tropes that are used to illicit an emotional reaction, is probably a more demanding customer more concerned with substance then someone who knows nothing. thats where the concept of a "real" gamer or movie goer or reader comes from. while it might be taken to extremes by some people, there is a clear difference in tastes and expectations between certain gamers. "real" might not be the best word, but you cannot deny that different people expect different things from their games. some people expect art, other expect competition, and others expect to waste time for a few hours. its only natural for people who dedicate themselves to an artistic medium, learning its history and the ins and outs of how things are made, would expect to be taken more seriously than someone who just partakes of the medium to waste time or beat their friends. but they arent. and that is frustrating as hell.