Rage quiters :(

ELO is a scoring system based on losing or gaining a set number of points. All players start at a certain number of points, lets say 1000. With each match, they can gain/lose a number of points where the gain+lose=a set number like 50. So lets say the radiant has been deteremined by the computer to be more skilled. The score could then be +20/-30 for them.In turn, the dire would have a +30/-20 since they are less favored so they can gain more points. The more in favor the skill is for 1 team, the less they gain. So more skilled players have a higher elo.

Yet you are still not recognizing that he said that this is something new. As in why is there an increase in rage quitters. An increase would suggest that previously there were less RQ and now there are more. So how can you tell him it's because he's not got to the level where RQ's arise less often. If you are indeed correct then the only logical conclusion would be that he has dropped several levels. That could make sense, except for the fact that it has happened to many of us since the game came out of beta and is a common complaint not just on this forum but many other dota 2 forums. I really feel your answer is merely to tell him that this isn't an issue at all, when clearly it is a recent change for many.