If anyone should "stfu" as you put it, it is you Rachel. Usage of certain terms in their derogatory form just clearly shows how intellectually bankrupt you are as a human being. Instead of spreading hate every time you open your lips maybe take a few moments and think about what you have to say. Try encouraging acceptance and inclusion of people with intellectual disabilities.
I actually feel sorry for you because you just made a blog to defend your pathetic, sad and tasteless word choices. I feel bad that you are so insecure with who you are as a person that you have to be so incredibly classy to use the R word. I hope you take a few minutes to visit http://www.r-word.org/ and make a pledge to yourself and those around you to become a better person. A person who values their own self worth, and the worth of those around them.