In the comparison between racism and sexism, the incident in the blog post would be comparable to a text book with a picture on the cover. The picture shows a

In the comparison between racism and sexism, the incident in the blog post would be comparable to a text book with a picture on the cover. The picture shows a generic programmer at work. While one could use a shot of a person of moderately dark skin with a unisexual haircut taken from an angle where no facial features are recognizable. Yet generally it's a white male. Or a black male. Or a white/black/asian/indian/latin man/woman. It's not an issue of racism in this case, it's merely the fact that it's convenient to pick someone and take a normal picture. That's why "he" is often used. It's just more convenient to stick with it. Any more meaning than that is just inventing interpretation.