As verbatim as I can remember our interaction:

Me: "I'm going to just put some user input checks here, no guarantees they'll actually input X or O, yea?"

Interviewer: "Oh, don't worry about that, assume for now that you'll get X on X's turn, O on O's turn."

Later:

Me: "Normally I'd extrapolate this to a function, so let me just - "

Interviewer: "For now, just focus on getting the program to response to the next user input."

Me: "Ok... well the fastest way to do that right now is just copy paste this code down here."

Interviewer: "That's fine."

But, it turns out, it was not fine.

I felt I was bamboozled.