What is the "right to EXIST"?

Out of all the people here who have interacted with trans people/advocates, whether for them or against them, have any of you encountered the term "the right to EXIST"?

In another (much more left-leaning) discussion board, I have encountered this phrase several times. It's typically used both as a means to justify their demands and arguments, as well as a defense against criticism and anything that might test them for hypocrisy.

This is most often used by people who do consider gender as a social construct and some sort of ideology, not a clinical or scientific thing. The meaning of the term is still elusive and varied, and I don't want to ask about it in that other place due to the heavy moderation and toxicity.

Does anybody else have a take on this?