It took him 10 years to sell 6 million albums? Wow. Lorde hasn't even been out for a year, and she's already holds a bigger song to her name than David could only dream of. Lorde will pass the 6 million mark faster than him as well.
Unless she has met him in person, how does she know he is gross? Seems to me like she's just talking crap just to talk crap. To be 16 and think you know it all...