Hmmm.  I won't launch into argument with the author here. But I do wonder why we cannot simply do away with any gender bathrooms and simply go to a common sink area with private stall bathrooms.  Or just private bathrooms period as often found in coffee shops such as Kalafi Brothers or Starbucks.  Hence one person at a time uses a bathroom no matter who they are or what gender, thus removing gender as an issue in regard to bathroom facilities.