Is it illegal to post curse words in English on your car?

Not illegal, but immoral.

Morality is one of the social ideologies and the norms and norms for people’s daily life and behavior. Morality restricts social life through social or certain class public opinion.

The automobile body structure mainly includes: body shell, doors, windows, front panel parts, interior and exterior decoration parts and body accessories, seats, ventilation, heating, air conditioning, air conditioning devices, etc. . It also includes trunks and other equipment on trucks and special vehicles.