iPhones and dirty pictures on the metro

This isn’t the first report I’ve seen of techno-exhibitionists flaunting themselves via phone on the metro, especially at anyone with a female-sounding username. This item says you should report occurrences to police, but doesn’t explain that it’s very easy to set AirDrop not to accept files at all, or only from people on your contact list – and that doing so is advisable in public. (CBC reported on this last summer.)