An analogy on the doggy theme: Cats and dogs are similar in many ways but observably different. So if I say that my cat is like a dog, people will probably understand that my cat shares some stereotypically dog-like characteristics. Maybe it is loyal or acts like a guard dog to defend me. Whatever. I can call it whatever name I like, accessorise it however. All absolutely fine.
If, however, I unilaterally try to change the word cat to mean dog and vice versa, so that when my neighbours are upset because they say my dog has repeatedly gone into their garden and used it as a toilet and I say "That's just what cats do, they just want to pee, get over it" or when I take my 'dog' to the vet and get upset when the vet says it's actually a cat even though I have called it Fido and put a lead on it and everything - well that infringes on other people's rights as well as biological reality.
And if I was to join up with others around the world who also believe cats are dogs and dogs are cats (and words mean whatever we want them to mean and let's queer all the boundaries) - it still won't make any of it true, it just means I have found a tribe of similarly confused individuals.
And if I get posters from Amnesty International saying "I am who I say I am" and attach them to to my miaowing dog and my barking cat, even that will not make it so.
Then if I start berating people because they will not call my dogs 'cats' to make me feel comfortable, even though they can see with their own eyes that a Rottweiler without a lead is in front of them and I say disingenuously "when has a house cat ever killed anyone?" that sounds like the gaslighting it is.
The most extraordinary thing is that people in my movement have somehow managed to get some people in government, and veterinary schools and the RSPCA and even the kennel club to agree that occasionally cats can be called dogs and dogs can be called cats (with some exceptions) and they can get a special certificate to say so.
Presumably they just could not foresee the potential harm of putting 'Rottweilers-with-a-cat-certificate' in a locked space with female cats and kittens...
But what they can never, ever do, because it's always going to be surgically, medically, scientifically impossible is turn a cat into an actual dog or a dog into an actual cat.
There are always going to be millions of real cats and dogs around, continually giving the lie to the simulacrum with its fake feline ears and its waggy tail.
So I guess the sooner I get over it, the better.