Problem is that you don't take the context into account. Like usual..
The problem here was not the post in itself, it was wrong but not sexist. The problem was the constant repetition of said post and said rethoric that was undermining Carrot's feet specifically.
Me: "Carrot flew"
Them: "No carrot jump a bit far"
Me: "Carrot saved the strawhats"
Them: "No Carrot just jumped from ship to ship
Me: "Carrot hurt Zoro with Electro"
Them: "No Carrot merely touched him"
Me: "Carrot is constructed as important, here is 1001 evidences of it"
Them: "No Carrot is irrelevant, no data"
Me: "Carrot is a very interesting character"
Them: "No Carrot is annoying and has a loud voice"
Me: "Carrot is strong"
Them: "No she was clapped by a
Yonko commander"
Me: "888 was meant to depict the Sulong of the mink and was a great Carrot Moment"
Them: "No it was just an introduction of the Sulong.
Me: "Carrot saved the strawhats multiple time on Whole cake"
Them: "No Carrot is useless"
Me: "Here are all the reason was carrot is such a well constructed character: Lore/characterization/Story/symbolism"
Them: "No Carrot is cringe"
Me: "Carrot is one of the most important Mink character"
Them: "No Carrot is just an animal, eat grass B***h*"
Etc. I could get on and on...
The problem is not one single occurence of one single post. The problem is the repetition of a clear dehumanizing, deligitimizing and reductionnistic pattern of Carrot's self, personnality, story and fits.
This dehumanization toward women and women character has a name : Sexism. (And in the case of the race being the target of that deshumanization : Racism)