I'll have to disagree. You're right about the difference between fan and fanboy. But not all fanboy are the same. From my experience on the base, I can say sasuke's and itachi's fanboys are worse, way worse than any other regular fanboys. They manage to come up with one stupid thing after another, all the time.To be clear, Naruto and Sasuke shares my 2nd favorite character spot after Itachi, from my point of view all fanboys are the same, they just follow different character. There is a big difference between being a fan and being a fanboy.
We constantly have threads with nonsense about sasuke and itachi, threads wanking them, overrating them, creating stupid things to favor them and calling it "manga fact", etc.
Usually, uchiha fanboys, and as I said, mostly sasuke's and itachi's, are much more annoying than the other fanboys.