How is this license plate racist?

Here's the article.
https://awm.com/a-teacher-sees-an-offensive-license-plate-and-sparks-state-investigation-2-2-2-2-2-2-2-2-2-2-2/?utm_campaign=buffer&utm_content=bufferce91f&utm_medium=facebook&utm_source=america&fbclid=IwAR3SX-7OuzP7RInRY9BOnWrrMCoIGbAWqzMg_TwiVTPL8oXiNpkGRe28mlM

They are calling it racist.

Okay. How is it racist? What race does it rail against?

Negro? Mongolian? Caucasian? Those are the three.

Which race?