But for girls and women, especially those who are survivors of sexual assault—it could be very upsetting even if the individual was not there for any bad purposes
Let's look at this from the perspective of whether that is fair to all the people that did not assault them.
Let's imagine for a moment that there is a large population of people who have been assaulted by, and only by, a black person, at an ATM.
It is an unfortunate reality of our world that the majority of crimes are committed by the poor in the US and the US has an endemic poverty problem among black people. The majority of money based assaults are committed by black people for this reason, a statistic touted by our board's racists time and again.
Does it make sense to have separated ATMs for black and white people because people may be uncomfortable having been assaulted by a black person at an ATM?
Now, change ATM and skin tone for bathroom and genital appearance...
We have a clear parallel between motivating factors (normal financial situation vs normal hormonal situation). We have a clear trend in trauma experiences. We have a clear trend in identifiability of commonalities with perpetrators.
I think in some respects, those who have such trauma reactions have responsibilities to understand that while a "person with a penis" attacked them, this is not that "person with a penis".
First of all, you are conflating poor and black with committing crimes. If the last 6 years have demonstrated nothing, it should be that white people, especially those with any sort of wealth and power are just a lot less likely to be arrested and prosecuted, convicted and imprisoned for their crimes.
Secondly, a large portion of women and girls have experienced some degree of sexual assault at some point in their lives. One in four have been raped. Very few of the survivors of sexual assault are traumatized by seeing men on the streets, in schools and work places, in their homes. Hell, a lot of them still live in the same homes with their rapists. I frequently saw the person who attempted to rape me at family events. So get off that right now.
Being in a dressing room when one is undressed and showering or preparing to shower or getting dressed again and being confronted by someone with a penis in a space that is supposedly for women would be startling for most girls and women, even those who have never experienced sexual assault. It could be quite traumatizing to be so confronted with such an individual when one is in an extremely vulnerable position: unclothed, partially or totally, and in a space where one did not expect to see anyone male.
Do I think this is likely to happen? I would guess--and I certainly do not know this as fact--that most pre or non surgical transwomen would prefer to keep their genitals private as well. This is probably not a very common experience and probably less common would be a trans individual intending harm.
I realize I am talking about a fairly remote possibility but imagine being a survivor of sexual assault, working out at the gym and stepping into the shower only to see someone with a penis standing next to you. Imagine if that were your niece or daughter. It would be upsetting, even if no harm was intended. I'm pretty certain that having women show signs of distress would also upset the trans individual.
Maybe this is just too remote a possibility to be planned for. But at least some women and girls would stop going to gyms and such if they knew that they might encounter an individual with a penis in the locker room.
I'm not interested in curtailing the rights of trans individuals to live their lives as they see fit. But I'm also not interested in seeing women have to further curtail their lives in order to feel safe.
Women and girls are taught explicitly or learn from experience to be constantly vigilant and how to curtail their own behavior in order to avoid attracting unwanted attention or sexual assault. You can try googling it yourself but here's a couple of links that describe every day things that women simply do:
34 Things Women Do To Stay Safe Show The Burden Of 'Being Careful'
www.huffpost.com
With sexual harassment and assault all over the headlines in Hollywood, sports, politics, and fitness, I’ve been thinking a lot about this topic and having lots of conversations about it...
www.girlsgonestrong.com
Please note: I am NOT suggesting that trans people are a threat to anyone else. I am NOT suggesting that trans people should not be able to visit the gyms and restrooms that they feel comfortable in. I AM suggesting that some thought needs to be given to how to preserve the sense of safety and even modesty that women need to use gyms and similar public spaces.