What does John 4:9 mean?
Samaritans were mostly hated by Jews for being religious and ethnic half-breeds. Men and women who were not related did not usually speak to each other in public. And Jews would never think to share utensils with an "unclean" Samaritan. Therefore, everything about Jesus' request would be suspicious to this woman. Being alone, she probably would not have approached a crowd of strange men. But the disciples had left (John 4:8), and Jesus might have been sitting in a spot she couldn't see until she was close by.That context makes it easier to imagine the nervousness in her question. Some translations include the comment about Jews not having "dealings" with Samaritans as part of her response. Others treat that statement as a separate remark. John does frequently explain cultural ideas in this gospel (John 1:41–42), so either one is a possibility. Whether the woman said this aloud, or not, it was certainly implied.
Jesus' answer (John 4:10) probably surprised her, as well. Judging by her reaction, she seems more than capable of holding up her end of an intelligent conversation.