There's stupid, and then there's oblivious. Maybe even a combination of the two. Even if one's a nerd or a geek, one should really have a clue about what goes on in the 'real' world. (But if the majority of bozos who don't have a clue how to protect themselves online [eg, on Facebook], they deserve exactly what they get.)
I guess this might be construed as an object lesson. {snort}
That must be wonderful; I have no idea what it means. — Molière