Officers sometimes give advise that contradicts law. Their advise may be safer but illegal. They are not knowledgeable of every current law. Even lawyers don't know all the laws. I would use the restroom that is permitted by local law if I could find out what the law is. If the law is grey I don't know what to recommend. What if a restroom women is offended then grabs an officer to question and possibly arrest you. That wouldn't be fun. Especially if your mug may makes the local news before you get a chance to powder your nose
On second thought. Odds are you'll be fine regardless of your decision. I've been known to worry too much.
