Appealing to a majority is by no means a fallacy. It's just you'd see it that way cause a small minority would call you a female at your request.
I don't believe in Mara. That she thinks these things, she just wants power. I'd seriously slap the bitch silly cause I hate fake accusations. And I'm very nice.
Appealing to the majority is literally a recognized logical fallacy when popularity is treated as proof of truth. A majority can be correct, but its size doesn't establish that it's correct. Whether a person's gender identity is valid isn't determined by a popularity contest.
Threatening to physically assault someone while insisting you're "very nice" undermines your self-description.