People are trying to make Coke sound bad because it's not good for you. I've done it more times than I could count, almost had a problem with it, but eventually grew to hate it because of the way it made me want more as soon as I was done, and the way that it left my wallet empty. Not to mention that when you do it for 12 hours or so, my brain would stop me from doing simple things like talking straight, and I'm not exaggerating.

I'll never tell anyone what to do or not to do, but just wanted to say what I said heh. Anyway your bro isn't as mature as you, just understand that is the primary reason he's acting this way. In time things will get better, but in the meanwhile why not be the bigger man and sit down with him and tell him how shitty you feel that he's been acting this way. Sometimes when people are put on the spot you can get more out of them.