Well now, this took a turn. I tried to be generous to Thacker's instincts, but didn't expect him to double-down on irrational arrogance.
Might be asking much, but we can hope. At least a good lesson for the rest of us!
It's actually a pretty common interview tactic...making the interviewee wait. It's not exactly kind, but it does give a bit of insight on the person's patience, and how determined they are to get the job.
It might have behooved OP to ask questions of the person he was speaking with a little more directly, or just ask where the restroom was to go and collect himself a bit. If you're desperate for a job, sometimes you have to prove that you're capable of it. If that means doing a song and dance, then so be it. Pity he missed out, but hopefully it's a lesson learned.
Might be asking much, but we can hope. At least a good lesson for the rest of us!