Well let's think about this.
At mostly every gaming party I know of it's just Halo and immature banter, CounterStrike which I stand by as being a terribly balanced and designed game as well as immature banter, and possibly DotA, LoL, or some other crappily designed game.
These don't seem very interesting or desired. I'd much prefer to go to a game party where we watched someone break into a new RPG, while enjoying fine wine and cigars or some similar situation.
Sometimes a party can be big or small, some involve things like getting drunk and all that, other times there are more niche interest gatherings (like a cigar one for instance), and other times it's just about watching a movie together and eating. Hell sometimes it's about a board game and there are some great board games. So yeah... I think people have different concepts of both what a party is defined as and what it consists of / is enjoyed at them.