Bronze, Silver, Gold, Platinum, Masters, Grand Masters.
GM is largely just professional SC2 players, or people who do 8+ hours a day.
Masters is where the best players are, sans GM players.
Platinum is where you start thinking more deeply about the game, and your mechanics are already solid.
Bronze --> Gold...just building basic mechanics...back in the day it was all a wash and bronze/silver really meant nothing, and gold was only marginally better. Today its probably more stratified because only the dedicated players still play, but its still comes down to mechanics development.
I don't know if you play SC2, but to be fair to him until you get to masters its all about improving mechanics. As you noticed in this other thread
http://forums.anandtech.com/showthread.php?t=2362170 the game isn't easy, its really really hard.
But the other problem is that people in masters and above are those who habitually play all the time, sometimes its all they play, so they know not only know the mechanics very well, but they spent a lot of time with mind games.
If he has been putting all those hours into the game and he is still only Gold..maybe the rage quit was worth it ;-) J/K. But if he is not Platinum yet, and he has been putting in all those hours, and its been a couple of months at this point, maybe he should reassess what he is doing and think about what he could do to practice smarter.
Learning to step back, analyze your actions, identifying what is working well and isn't, and charting a course forward may be a great life lesson to take out of this.