Nope. Not reversed. The guy I responded to thinks that almost everyone (9,999 out of 10,000) knows sidewalk chalk isn't made out of chalk. I'm saying it's not even as common as 9 out of 10 know that sidewalk chalk isn't made out of chalk.

In fact, I'd say the odds are more like 1 out of 2, at best. Possibly even that more people would give the wrong answer than the right one.