A person that is either afraid of games or is no good at them.
These people quite often try to bad mouth gamers or call them lifeless, as they fail to grasp a game and must assume that it takes years to get as good a 'gamer'.
The fear can show itself in extremes were people react to the fear by screaming and or posting anti-gamer rhetoric.
Gamerphobes have created an array of names for people that are capable of playing them.
Gamer: "That's five wins in a row"
Gamerphobe: " You're just lifeless and live with your mom and play this game 24/7, that's the only reason you won!"