Jargonwatch: Like White on Rice

I never heard the phrase "Like White on Rice" before the past year. I don't care for it. Different sites (such as this one) seem to think the rationale for the analogy is clear and obvious. I don't agree. It is easy to figure out the meaning from context, but I really don't see the analogy being so strong. To be annoyingly technical, white's pigmentary relationship to rice is more "of" than "on".

2022-06-07 Postscript: this one seems to have died out very quickly.