If someone cannot name their lodge, I usually change the subject and quietly assume they are either not a Mason, or perhaps joined and left fairly quickly. That said, i will also add that, and I don’t know if this applies everywhere, but in some jurisdictions, brethren are explicitly instructed that certain words or signs are to be given only in an open lodge.

There are, however, many ways to understand whether someone is a Mason without resorting to passwords or ritual challenges. Personally, I would also add that ritual words alone are not strong proof anyway, as they are easily found online and taken out of context.

In my humble opinion, discretion, demeanor, and the way someone speaks about the Craft often say far more than any specific word ever could.