I feel for your brother. We've all had at least one of these matches. Fortunately they are fairly few and far between.
But it all evens out in the end. Statistically there is actually a great chance of there being a troll on the other team. Let's assume you aren't ever a troll on your team. Let's also assume (and this is generous) there is one troll in every game. That means your chances of having a troll on your team are one fifth less than the enemy team. (I'm tired and can't think of a better way to word that)
So to summarize, I'm sorry, but fear not! eventually it will even out. Though you may never even notice it.