Of course, Saint is right. Justin Beiber's music is retarded. I don't know anything about him personally because I don't pay any attention to any of the types of media where he would appear. Nevertheless, here's some relevant info from Wikipedia:
Bieber has received numerous awards, including Artist of the Year at the 2010 American Music Awards, and was nominated for such accolades as Best New Artist and Best Pop Vocal Album at the 53rd Grammy Awards. With a global fan base, termed as "Beliebers", and over 20 million followers on Twitter, Bieber was named by Forbes in 2012 as the third-most-powerful celebrity in the world; he had earned an estimated US$55 million in the previous 12 months.
So it's a pretty apt comparison.