Why does the internet love to hate fan girls?

There's nothing wrong with a healthy celebrity obsession - but throughout pop culture history, fan girls have had a bad rap. While being an expert on a topic is seen as intellectual being a fangirl is often portrayed as hysterical, immature and downright creepy. So why aren't the same judgements made about male-centric fandoms? And why do we care so much about what women do with their spare time?Guest: Anna Levy for ABC Digital