People respond to me that way sometimes, and it always confuses me. I’ve already addressed everything that I know or believe that you want. I’m asking “any questions” or “anything I missed?” out of humility, because I know I may have done an incomplete job of satisfying your questions since my mental model of your perspective is incomplete.
I’m asking “any questions” as an invitation or an offer—it feels weird and vaguely hostile when my conversation partner rebuffs that offer like that.
(Not that I take it in a mean spirit—like I said, more confusion than anything)