DBZ fanboys
Pretty much troll everything that isn't DBZ. They troll Naruto for being a cheap rip-off, One Piece for being a childish rip-off of DBZ and Yu Yu Hakusho for being... also a cheap rip-off. The only series that stays save from the DBZ fanbase is Bleach, because it is as hardcore as DBZ and carries the same deep underlying story elements.
Naruto fanboys
Troll DBZ and One Piece. DBZ for being mindless and not having the human emotions that the Naruto characters have. One Piece for bad art, bad characters, bad story and no development. Probably forgot some. Oh yeah, no-one dies.
Bleach fanboys
Troll One Piece for looking childish and having no manly men like Bleach. And no-one dies. Also, Bleach fanboys have become self-aware enough to also troll themselves.
One Piece fanboys
Troll the rest of the Big 3. In Naruto's case for being plain retarded and Bleach for its lack of background and still being stuck on Namek. Also, they're very jealous of the popularity of both.
Yu Yu Hakusho fanboys
Troll the Big 3 and DBZ. The Big 3 for never being as good as 90s manga and DBZ for being incredibly mindless compared to the brilliant fights and characterization in YYH.
Tite Kubo
Trolls Bleach. Relentlessly. Still hasn't succeeded in getting the manga cancelled though, but each week he tries harder.