I can’t find any source to indicate Race Inspired Cosmetic Enhancement was ever a term that existed as anything other than the Japanese version of an N-word-pass.

That is to say: the acronym only exists as a means to explain why I should be allowed to continue calling your car a RICEr.

The problem here is that someone fabricated an explanation for why they should be allowed to continue to say RICE, in response to a fallacious argument for why they shouldn’t be allowed to.

The term is so far removed from any malicious origin, that some people wouldn’t even know they should feel offended, unless someone told them they should be.