But I've been using public restrooms for decades and never had any issues!
Good for you!
You've most likely been observing good practice.
We're asking all who may be of advanced standing (post-op, fully-transitioned, legally "F", decades of mainstream public experience, noted persons in the TG community, etc.) to please help set the example by using restrooms appropriately and encouraging others to do so.
Next FAQ entry (13.11): What are some examples of good practice regarding restroom use?