Cis people look at us and see something defective and fundamentally disordered.
We violate "man" and "woman" and "boy" and "girl" so deeply for them, that their response is a wave of revulsion, alarm, hate, and a will to extinguish us.
They don't want access to medical care for us, because that would allow us to further violate their sense of male/female. They don't want access to gender appropriate spaces and life conditions for us because that would further violate their sense of male/female