Can You Say Uptight?

We went to a party on Friday of mostly Dartmouth and HBS people. I was talking with someone and after discussing being married to a b-school student, we had the following exchange:
me: So, do you have a girlfriend?
him: [silence] Um. no.
me: Oh, I'm sorry, do you have a boyfriend?
him: [pause again] No.
me: You paused, so I wasn't sure.
him: I paused because I was startled by such a direct and personal question.

And I thought I was on best behavior.