Casual gamers: people who play games for fun, and care not about the continuity of the series or the hardcore details of a character's backstory.
Hardcore gamers: people who play games for fun, and DO care about the continuity of a series and maybe even the hardcore details of a character's backstory.
Problem solved.
So casual gamers play games casually, and hardcore gamers get so frustrated that controllers break in fear of their anger (or rather, as a result of it).
Actually, there's a problem inherent by using labels such as hardcore and casual. As with all labels, everyone has the potential to interpret, and thus define, each label differently. This causes discussions such as this when people define their definition of "hardcore gamer" and find it clashes heavily with that of another's. Personally, I just play the games. Yeah, I know a myriad of random facts based on a multitude of series, enough to fill a book, but I still find that my dislike of FPSes has me fall under the category of "casual" by the definition of other's, but under "hardcore" by my own.
This is what causes the inevitable flamefest that most of these "casual or hardcore" discussions tend to degenerate to after a period of time, and frankly there's no reason for it. It's ultimately pointless. Why should what genres we like and dislike, or what characters we love and loathe, determine what kind of gamer we are? Why should the varying levels of knowledge on subjects ranging from composers in RPGs to clip capacity and maximum range in Call of Duty determine whether or not I'm a gamer capable of handling certain games?
The reason for all these genres, all these games, is variety. If there was only one genre, then gaming would be pretty boring. In fact, a similar situation is what caused the near-downfall of gaming back in the early 1980s. Too many games that were just remakes of remakes of remakes ad infinitum, and consumers got sick of it. The result? A near-catastrophic slump in the industry that was only remedied by the creation of the Nintendo Entertainment System (the name and also the term Game Paks were used to separate it from the term "video games" which left a sour taste in people's mouths as a result of the crash). And this isn't a Nintendo fangirl speaking here (it's pretty much gaming history) so don't make claims of that.
How is that relevant to the discussion at hand, you ask? Simple. People here are separating gamers based on the genres they play, when it is the very variety of genres that make the gamer community so diverse. If it weren't for this variety, gaming as we know it would not exist. To all of you who claim that just because someone dislikes Call of Duty makes them unworthy to call themselves a "hardcore" gamer, you're wrong. We are just as entitled to that term as you. Just because our definitions differ does not mean that one is right and one is wrong; it's all up to personal preference, just as with the games we play. Hardcore and casual are terms of which the definitions are created by the people who use them. There is as of yet no common agreement on the exact definition of either term, and as such I fail to see the point of threads like these which, as stated previously, tend to degenerate into flamefests. That said, I define myself as hardcore, if only for the aforementioned large repository of random facts regarding video games locked within my mind.