I vote for him being rude. Many moons ago, my mom's bf tried to set me up with someone she knew. I wasn't all that interested, but I agreed. I went to some function they were at, and he was too. We chit chatted a bit, it was awkward, but then, having exhausted all other topics of conversation, I asked him what he did, and he then repeated back to me, in this incredulous tone of voice "what do I do?" Like I just just asked him some really deep, personal, question. I took my leave shortly after that as I didn't get why he had such issues with my asking him.