I would not start believing it was a kitten. That's because we never use the word kitten to refer to a shark, in our universe.
Hence the question: how many people would need to start doing it before you'd accept it?
no matter how many times you showed me a photo of a shark and told me it was a kitten, I would not start believing it was a kitten.
And yet we must accept that women are males if enough people say so?
Are you telling me the shark in the picture self-identifies as a kitten?
Why can't it? What's a kitten identity? If it's anything like a female identity, it's not confined to kittens just as female identity isn't confined to females, begging the question of what it means at all. So why not?
And if it did, would you accept it as a kitten?
they don't have complex thoughts.
So what? Does your understanding of it being a shark rest upon what's going on in its head?
non-humans don't have gender identities
Yet we can still sex them. I don't have a gender identity. Am I not human?