This is gonna get closed, but oh well, my two cents before it does.
I agree with everything everyone else has said, but to add to it... with all due respect, you need to grow a thicker skin. Autism is kind of a different matter in itself, but even brushing aside the fact that you do not say something like that to someone no matter what malfunction you're branded with, you should probably work on letting petty insults like that slide off more easily. It doesn't seem petty when you're the one experiencing it, but when all is said and done, it is petty. Partially because it's coming from your brother, and partially because it sounds like he was just trying to annoy you enough to give himself an advantage... or was a sore loser/winner, I guess.
Obviously it doesn't happen overnight, and it takes a lot of conscious effort and growth, but... food for thought, anyway.