The Wikipedia definition seems to indicate it has origins as a racist term and I’ve never understood why unix users have adopted this terms instead of something benign like “themes” or “theming” which I remember being in use long before I ever heard “rice”. So what gives? Why use “rice” instead of “theme”?
I only know the term form car tuning. And specifically used for tricked out Japanese cars. The term picked up steam after Need for Speed - Tokyo drift.
Besides that it’s also used for Race Inspired Cosmetic Enhancements. Only cosmetics and no performance, the opposite of a sleeper car. In this case it’s a bad thing. And if a word is used in a bad way and has a possible race connection in can be considered racist. If someone feels offended because an it’s race related, just assume it’s racist.