Fans who love to hate on a character even more than liking their own favorite.
Taking this forum as an example, many Zorosexuals talk more about Sanji or Luffy than Zoro. It's kinda pathetic.
I'm not specifically singling out Zorofans btw, some other fans do this too, however from what I have seen the big majority are Zoro fans even in other places like twitter and Reddit etc... so it is what it is.