Bay Area people are known to spend a lot of time in Tahoe when it's cold. So this is more, "Let's repeat that untrue joke about people in the Bay Area knowing nothing about winter."
https://en.wikipedia.org/wiki/Salt_Belt
(And yeah, you're right: CA isn't one of them.)
Sand only works when it's barely freezing. Which can be true at low elevations, but not at 10,000'.