How would you handle this?

[wisref2]

Another chance for my famous saying:

You're gonna get yelled at anyway, so get yelled at for doing the right thing. I would keep calling it correctly, and let him keep making the mistake.

After the game, I would talk to the white hat and explain why this is a foul at the snap and not a false start. I was in that situation when I joined my first varsity crew. Took a while, but I finally convinced them that I was right. I also made sure we talked about the difference at our local association meetings so that everyone, especially the "experienced" guys, understood the rule.