I'm sorry you find it offensive, but I honestly just don't care. This is he Internet and if you find some petty shit like that offensive, you're better off not going online. And although I do feel for you for your brother, what does hat have anything to do with you and I? I'm not going to feel sorry for you and change my life because your brother is retarded.
Don't get me wrong, I'm not a bad guy. I joke a lot and that's all my previous post was, but if you can't handle a little joke or a troll, you definitely won't be able to handle some hate that the Internet will throw out at you. You also just make it worse by talking about your personal problems.