Ricing is a racist term. I am telling you right now that it is a racist term referring to a type of car modding that Asians are stereotyped as doing. It is explicitly used to deride and exclude Asians from the car enthusiast community. Anyone who's into cars or around people who are has heard this term, but you can Google it if you want.

What does it say about you that you'll deny basic, well known facts to defend using such an exclusionary term in a tiny community with a large amount of Asians in it?

As someone that was very into cars (still kind of am but not nearly so much) and tuner culture. Yes, "rice" in the context of customizing a machine to your specific performance needs has always had racist baggage and likely always will. This is a weird hill to die on bud, and it makes you look very sus.