A bit offtopic, but the author seems to assume you are a straight coder guy. This was probably not his intention though. Why not replace "girlfriend" by something more neutral, like "your better half"? Being inclusive doesn't cost much, really.
The language we use, especially the language we use casually, defines how we appear. To those outside the predominantly straight white male clique of programming, repeated exposure to these casual assumptions of stereotype pile up and create a sense that those not fitting the stereotype are unwelcome. Imagine if, every single day you had to drive around the same pothole in the road into coming traffic: eventually, you'd find a different route.
"Come and see the violence inherent in the system. Help, help, I'm being repressed!"
There is a straight, white male clique-iness to the programming world. Most blog posts assume the reader is a straight, white male. These are turn offs to some people, whether conscious or not.
That said, I can understand people being touchy about this, as these issues have become very polarised. PC should be about helping people choose to use inclusive language, but some people choose to shame people for getting wrong.
And BTW, "girlfriend" could apply to gay coder chick.
The author is just giving examples of people you can talk to, if it just said 'Call your girlfriend' that would be different.