Is seeing the best in somebody in order to get along the best idea, even if the things that bother me are...?

Maybe you just don't know your brother that well. He could be having horrible days or experiences and cannot express it. I could be like everyone else on here and say that you should talk to him or work it out but I know all that is easier said than done. Your Mom is right, focus on the positives instead. That's the best that you can do for now. Also....by blocking him out you're not showing him any effort from your side. If it means this much to you then try harder, you already made the first step by writing how you feel on here. You'll be fine ^____^