It’s a few years old now, but there’s a very worthwhile look at sexism in publishing over at YA Interrobang:
The article discusses the way women build up different genres, and how those genres are laughed at and treated as “lesser” than areas men write in. It discusses how the moment a man turns up and has some success in an area of publishing (i.e. John Green in young adult fiction), people consider the books legitimate.
We’re conditioned to believe that women’s interests are fringe interests, and that the things we write aren’t as good as anything produced by men.
The same can be said about Nicholas Sparks in romance/women’s fiction.
There’s also a discussion about it at the Absolute Write Water Cooler that is worth a read.