I agree. I just don't think the majority of Zoro fans say those things.
And I'm saying that a few guys with crazy takes don't represent the entire fandom. But in the community, Zoro fans are generally the common enemy and people justify it by saying stuff like, "Zoro fans are delusional and we're just retaliating."
Also, I genuinely think it's less toxic to uplift your own favorite character beyond their paygrade than to continuously trash other characters in order to downgrade them. For example, when some Zoro fans say "Zoro is Yonko level, Zoro is top 1, etc." it's not with an intent to downplay the actual top tier characters, but rather to uplift Zoro.
What I see with most anti-Zoro folks is the opposite; they would rather drag Zoro down than lift their favorite characters up.
Obviously, there are Zoro fans who like to trash on other characters too, but I don't see how they are any less egregious than people from other factions.