In the era of social media, there seems to be a lot of delusions about who usually populates forums (see the GAF trend where people post pictures of themselves as avatars). Forums, IRC, usenet, etc. have always been havens for socially shunned and ignored nerds who spend their weekend nights trolling forums instead of going to parties, hangouts, clubs, etc. A lot of said nerds are likely thought poorly of by the opposite sex ("Hey, women gave me the middle finger so here is me giving the finger right back!") and they feel resentful of it. So anytime there is a time to take a jab at women, it's an open opportunity. I guess laughing at women drivers makes them feel better before they realize they're a 25 year old virgin who needs to clean up his jizz-caked shirt before he heads off to work at the closing shift at Gamestop.