On the basis that one person may or may not abuse the situation all trans people deserve to be accused and/or treated as second class citizens? There are current real world incidences of cisgender women getting harrased and assaulted in these very “safe zones” under the guise of protecting cisgender women.

The exclusion of trans women from these spaces creates a culture where some people are on the lookout for those who “don’t belong”, and this is leading to women who don’t fit visual/societal definitions of feminity and womanhood to getting singled out and harrased in these very spaces.

Trans women are not “the other gender” as you put it, they are women; trans men are men. Bad actors who want to assault women or vulnerable people will do that any way they see fit, their gender identity is irrelevant. Being inclusive to trans people does not eliminate safe spaces, they are also deserving of being protected.

Now, I think a mixture of the two formats looks best to the eye, fightiiinng.