Actually, the locker room argument is about the right to privacy. As the LGBTQ+ community pursues the argument that there are many genders and not just two, it follows that if we are going to afford people "privacy" rights, that they be able to decide who they are willing to share a locker room with or a bathroom with, not society.

That will eventually translate into separate "All gender" individual bathrooms (this transition is already taking place) and individual dressing and shower areas within locker rooms that afford each individual privacy.

The Supreme Court established that the "right to privacy" is an extension of the human right to pursue happiness in the original Roe v Wade decision and that part of the decision was not reversed (the part that was reversed was the Supreme Court's decision on how to balance a woman's right to privacy with an unborn baby's right to life). So, it is a matter of time, before a court declares each person has the right to access a bathroom, shower, or dressing area free of other people regardless of their gender.