It's not as cut and dried as that, each genre has their own sub genres and sub species of players, most FPS players aren't beefy jocks or something similar (although because FPSs are generally a shorter or more intense game they attract these type of player), just like alot of RPG players aren't fat, bespectacled shut-ins.
You see RPGs that have effeminate spiky haired characters are called JRPGs; Japanese Role Playing Games. They are completely different to western RPGs. Western RPGs are all about customisation: creating a character that you immerse yourself in and then going out into a world thats all about choice. JRPGs have a character or a bunch of characters that have a set bunch of skills that can't be changed (Though they can usually be upgraded with all those shiny xp points you must grind out of mobs) and exist in a linear world that the player has little to no choice in. JRPGs are all about the storyline, the player is simply there to hack their way through the often brilliant and fun combat at the same time as absorbing the fantasmagorical plot. In both types of RPGs their are often awful amounts of grinding, but you have to get xp somehow.
Then there are Action RPGs, FPS RPGs (Oblivion, Fallout 3), MMORPGs and the list goes on.
FPSs aren't always an online swear fest, many are meant to be enjoyed as immersive single player games (eg. Bioshock, System Shock, Deus EX) with stories just as rich and deep as any RPG. Many aren't all about action (though it is the accepted norm). Repetition is not really something to complain about in an FPS, the game is all about point and shoot over and over and over, thats like complaining that the sun lights only half the earth at a time.
FPSs are a solid and dependable form of instant entertainment, just jump on and log in to a multiplayer game, most of the controls will be the same from game to game so there is hardly any learning curb. By their very nature they are some of the most accessible games created, some people resent that or just don't get them.
So in Review, its not all cut and dried. Go out and play more and many different games, decide for yourself or something.