As a once-a-month non-rev, I'd say that it's inappropriate for a non-rev to even be identifiable as a non-rev, other than if they're in uniform. But behavior like that is inappropriate.
I don't have bag tags, don't show my ID badge, and don't even take food or drinks when offered. In short, I'm the only person that will ever know I'm a non-rev other than the occasional crew member that knows me (unavoidable after 30+ years as a pilot for UA).
FAB