Why Nintendo Fans Are Called “Pigs” (and Other Things) in Japan kotaku.com

Online in Japan, mean nicknames aren't unique to Nintendo fans!
Previously, Kotaku covered the mocking monikers given to Sony and Xbox fans on Japanese gaming forums and in blog comment sections.
Originally, the dig against Nintendo fans was calling them "Nintendo shinja" (任天堂信者), with "shinja" (信者) meaning "believer" or "follower".
Fans of other consoles are given similar nicknames; for example, Xbox fans are also called "Xbox shinja" (Xbox信者).
If Nintendo fans are called this, Xbox fans are called gropers, and Sony fans are called cockroaches, at least all the online nicknames are unpleasant, each in their own way.