You had already won the game at "interesting set of assumptions you made about me". Learn to spot concessions like that and either drop a pithy one-liner like "Well, explain yourself more clearly next time." or just walk away.

I'm not trying to be critical or snarky, just pointing out things I used to do myself before I learned the rules. If that's the response you got after blowing them out, you won. Don't give them any more slack to potentially trip you up.