I heard some guys talking about being a real gamer in Game once. To be honest, they sounded really obnoxious about it, I heard "...that guy's not even a real gamer lol!" Yeah they said lol, I hear it a lot, not important. After they said that I thought it was such a weak thing to say about someone else. Thinking you are better than other people is pretty much one of the easiest ways to get me to dislike you.
I think that people working at a videogame store should probably have different values from the ones shown that day as anyone who enjoys games regularly is in my opinion a real gamer, not a hardcore gamer.
A hardcore gamer usually spends hours practicing and playing games to be much better than other people, which usually makes them "that guy" at parties, who makes the game less fun for others because they are so good, I know this, because when playing with my friends I'm "that guy" though I wouldn't say I am a hardcore gamer.
I have since learned to play easily and let people win at least equally to me, though deciding to let your mate win after you have ground his health as far as you wanna go to be satisfied that you were going to win, then having them go "SUCK IT! I'M AWESOME!" is a risk you have to be willing to take in order to let your friends enjoy games as much as you do.