Hmm... the way I see it, the lines of what a gamer actually is have been blurred.
I guess I would fall more within that classical version of a gamer. Loads of games, loads of consoles, really invested in the industry, its workings. Stepping into the shallow pools of game design.
Hell I'm even as far as to actually be seeking out old games and playing them as well. I never had a NES, but I love Castlevania. I thought MULE to be oddly charming. I got over 200 GOGs. Just love jumping in and trying a game, and reading the history around that game, putting its quality into a relative context.
I like to call myself an "Enthusiast". I think I have gone to a level higher than just playing and enjoying games.
Maybe thats what a gamer is "a person that regularily plays and enjoys games". Its just a shame "Gamers" these days, the ones I generally meet in the general populace, like crap like Call of Duty, and FIFA.
Then again, I think the entry point is different.
I got into gaming when I was very young. I grew up around games, I definately grew a more humble and respectful, but also fun approach to playing games. Especially competatively against other players.
The "gamers" of today seem to enter at that older childhood/teenager bracket, bringing that class-room maturity with them. They get mad when they lose, they cuss, and they will cheat if they can get away with it.
Thats not to say they are all like that. It is a bit of a generalisation, but from my experience, that seems to be the case most of the time.
I always put "casual" gamers into a sort of non-gamer area. They play Facebook games, simple little arcadey stuff on their iphones. Its cheap, it doesn't require a huge amount of investment, and it fits nicely in with their other activities.
My parents are like that. They played games like Pac-man and Space Invaders as kids, but it didn't stick to them. That nostaligia is kind of their still, as they love playing those kind of simple games, (sometimes fiercly competatively like in Tetris and Bejewelled Blitz).
EDIT: I guess I don't make it easy for myself.
I mean I'm 21 years old, but I don't act like a 21 year old in my part of the country would.
Its bad when supposed "gamers" are truly baffled and alienated by everything I talk about.
(To be fair though, not many people can keep up with me! XD (It made university very difficult. Sure people are friendly, but I never made a good connection, not to that point where one could share a room or a house, (or a bed! XD))
It truly is a shame, that the only gamers I have ever really known in person were the people I hung out with at my secondary school. Playing Super Smash Bros. Melee on a mini TV at lunch breaks, and hung out for sleepovers at my best friend's house (And only 1 or two of those people I keep regular contact with)