That exchange was ridiculous. I brushed his ego by correcting him on what is supposed to be his core competency, and he resorted to bullying and fallacious reasoning rather than admitting he was wrong.
It took some work, but I managed to corner him.
I didn't want to lose this argument because he was trying to make me look foolish when I was technically right. Since he has a lot of street cred, I feared that a lot of people would take his ramblings as correct.
And some did. I got at least three down votes on the first message.