"I'm still not going to use itsshower facility. Too risky. Some random transphobe makes a fuss, and it becomes a whole thing. Not worth it."
Alternative: "I don't use the female showers because I'm male, and aware that 1 in 5 women have been raped, and that the majority have been assaulted or harassed by men. I'm also aware that even the woman fortunate enough never to have been harassed might not feel comfortable sharing a shower with someone male, no matter the gender identity. I respect women so I try not to make them uncomfortable."