Because it shows that that her name alone is barely enough to get her referenced in TV shows, movies or any other aspects of the pop culture.
If she's mentioned, she's mentioned with Chris Brown. Go ahead, list some of the others popular TV-shows which referenced Rihanna in a positive light.
Meanwhile, while all of you come at Bey with accusations of bleaching and adoption, it remains a solid fact that everytime she's mentioned in TV-shows, it's mostly as a synonym for greatness while Rihanna always gets tied to the peak of her career, the Chris Brown incident. Not the Rihanna incident, mind this, the Chris Brown one.
When was the last time a person of any real significance has mentioned Rihanna in an interview, or did anything like this? Point remains, Rihanna has no impact.
Beyonce is just the current pop culture zeitgeist like what Paris Hilton/Britney/Lindsey were 5 years ago. Its not gonna last forever.
Rihanna is building a solid foundation by focusing on impact with her music.
Thats what people will remember at the end of the day.
I was actually watching this black sitcom on TBS and they had an episode where they wanted tickets to this baseball game, I think by this radio station. They played Rihanna singles all day, and they had to call in first when there wasn't a Rihanna single playing.