(On the theme of the post, I think that bluntness is most polite here—this conversation doesn’t look like it’s about to progress further without prodding.)
TheOtherDave did claim to know person X’s gender? Unlikely, given the point of the example.
TheOtherDave did inform you of person X’s gender? Then, to repeat the question: What is that gender?
As a matter of fact, you did.
(On the theme of the post, I think that bluntness is most polite here—this conversation doesn’t look like it’s about to progress further without prodding.)
TheOtherDave did claim to know person X’s gender? Unlikely, given the point of the example.
TheOtherDave did inform you of person X’s gender? Then, to repeat the question: What is that gender?