Can you use chopsticks?

Hashi-memashite! (箸-めまして!)

This is an inquiry received by all foreigners at least once a week. My friend just emailed me to tell me that an old lady had just asked him that very question, while eating his lunch WITH CHOPSTICKS. He politely responded, "No" and continued eating his meal. She looked puzzled...
(Hashi = chopsticks; hajime-mashite = nice to meet you.)