The author isn't making a point about ignorance. Everyone wants to act like he's blaming the cabby and he's not. As someone who is constantly in this situation,

The author isn't making a point about ignorance. Everyone wants to act like he's blaming the cabby and he's not. As someone who is constantly in this situation, it's tiring. It's a reminder of how many people treat me as a gay man first rather than a software developer. It's the same problem with the people that say "Oh, women at conferences should be flattered by the attention". They want to be seen as equal. I want to be seen as equal. Having to stop and explain, "No, I don't have a wife" is a reminder of the fact that most of our society still walks around assuming every stranger is straight.