We have far more important concerns than this silly bathroom business. Cross-dressers have been around for years, and they often use the bathroom matching their appearance when they are in public. So what, so long as discretion is exercised? No one gets hurt, everyone goes about their business, and no one is ever the wiser. That's the beauty of having stall doors.
Don't ask, don't tell has worked for years; we don't need new laws, nor do we need ridiculous fear-mongering about predators in bathrooms.