I've never had a sticker on any of my cars unless it was needed for permit parking or entry to a facility (I grew up on military bases.)

It's fine if you want to advertise your college, favorite sports team, political position, or something funny. I don't. Just seems pointless to me, unless you can't identify your car in a parking lot.

And yes, it is racist, even if used by that race. Maybe a "W"' for a female driver? Or an "A" for asshole who was a convicted road rage driver. Maybe a number for how many traffic infractions the driver has had? Points left on their license? "Felon on board"?

Sticker your car how you want. I think it is silly. Maybe I should make a sticker to that effect? "Bumper stickers are silly" Using Comic Sans, of course.