Overall I think SO makes valid points, but they were only ever going to provoke an "up yours" reaction from a person with limited range of vocabulary, experience and manners.
Cyrus's actual response is stomach turning with the cruel and unnecessary reference to mental health. Not cool.
Lenox has hit it on the head beautifully. The good thing about Rihanna and Cyrus is that they've reached the end of the road. We've literally seen it all now. Unless they find a way to actually turn themselves inside out or eviscerate themselves for our "entertainment" that's it.
They have reduced their shelf life exponentially, even Gaga and Madonna have had to tone it down eventually. In the case of Cyrus she seems destined for a blow out ending. In 2 years she'll be reincarnating Hannah Montanna for Dancing With The Stars, because all those hangers on will have bled her white.