The girl wasn't even rude. She could have just told her to mind her own business and not comment on her personal life instead of making fun of her looks.
Well, that would have been a lot classier, but Twitter-Rihanna has never really been...classy.
Let's just hope Rihanna really is as tough as she acts on Twitter when it comes to Round 2 with Chris, or she'll look like an even bigger mess than any of the people she feels brave enough to tweet insults to.