You can't deny people's existence and still expect a meaningful discussion or cooperation.
This "denying existence" thing is so jarring and I want to talk about it.
If someone says something false about me, like say if they claimed that I was male, I wouldn't say that they were denying my existence.
The only way it this claim even starts to make sense is if the people claiming their existence is being denied see themselves not as embodied human beings, but as fictional characters.
I have tried, in the interests of empathy, to imagine a scenario in which I could say those words, and this is what I came up with: if I was pretending to be my own imaginary friend, or spirit guide, or something, and someone said "quit playacting, Kan!" then , in the voice of my imaginary character maybe "you're denying my existence" would make sense.
But from the perspective of an actual embodied person, it's clear that someone talking to me or about me is not denying my existence. So the claim that "you're denying my existence" is a tacit admission that the speaker's identity is fictional .
There's also a very interesting projection happening here - the person having their existence denied is surely the embodied person who is acting out the fictional character, who is no longer to be spoken of or acknowledged in any way.