There are always going to be extreme fans and opinions on both sides of the spectrum. One blindly supporting the series and oda irrespective of how bad certain things are and one blindly hating it.
It is same for most fanbases.
It is same for most fanbases.
I think it has to do with DBZ, Naruto, and Bleach. Most people started off with those as their gateway anime before getting into One Piece in the West, and it didn't help the Big 3 were ongoing at the same time.
Preskip One Piece was simply mogging the writing of Naruto and Bleach, going from Naruto's writing to preskip One Piece was like a new stronger drug just got introduced to your brain and these cult like One Piece fans are still living off that high. They've developed a superiority complex cause of it. One Piece hasn't been good in ages but they still act like Oda could do no wrong.