"you're" or "you are" if you're going to call someone retarded, at least try to use the correct word.
"didn't" if you're going to call someone retarded, please use correct spelling.
And finally, you can't capitalize one and not the other, and 'gayboy' is not a proper name or noun, unless your name is Gayboy, and you're talking about yourself, then it would be perfectly fine to capitalize it. So again, if you're going to call someone retarded, at least do it correctly, because right now, you look like the idiot.