I also found an article that suggests that stereotype may play a role in how well kids do in specific subjects. For example, the article states that "you act like a girl" is still a huge insult for young boys. Things like language and arts may be considered "girly" to boys and therefore affects how well they want to do in the subject, and how hard they try. I believe that every child wants to do well in school, but if they are struggling in something like language arts, they may just disregard it as a girly subject and not try as hard to succeed.
What are teachers to do about this? Creating an environment that both encourages equality in gender, but at the same time recognizes the different needs of boys and girls is ideal. The last article I linked ended with a great quote: "Pitting boys against girls in competition for a good education is out of place in today's world. It shortchanges both sexes. The educational gender wars must cease. If we must have a war, let it be a war against ignorance. In this surely we are all on the same side!"