But that's impossible! Girls don't even know what computers are, let alone how to do something as complex as launching a SQL injection attack*.
Clearly this must be a ploy by Anonymous. It's all men in Anonymous. There are no girls on the internet!
This trope is a common one that the media does little to dispell. In addition to perpetuating the belief that the only thing women could possibly ever do on a computer is use Facebook, they also seem to imply women could never possibly do something as Dark and Dangerous as hacking.
I of course do not condone black hat hacking - but - I think everyone assuming Kayla must be a guy is sexist.
(*) Actually, what I find the most entertaining in the media is that most of these attacks to not require much cleverness. They are just exploiting human engineering error (poorly written code) or human social error (social engineering). Given most software looks like Swiss cheese as far as security is concerned, and given most people have no training on how to spot a social engineering ploy, the success of these attacks is hardly surprising.