he wants to do to his property, and the fact that his tastes in aesthetics do not match up with yours. I figured I'd actually answer your rhetorical question because you seem to ask it so incessantly... Perhaps you actually didn't know why you see this happening?
You don't like the ricer look, some people do. Keep your car not rice and accept that he's done what he wants to do with his car. Everybody's happy. It's truly not that difficult is it? Maybe one day you'll reach this level of maturity...