In US, other non-protected speech includes threats and obscenity. If you're calling out bureaucrats in public be careful not to use any obscenity or you might find yourself charged with disorderly conduct, a misdemeanor criminal charge. No harm is required.
You're right, I looked up obscenity and it applies to screen/print media rather than directly spoken language and is based on local interpretations of what is offensive to average people and not considered artistic. I wonder how this can possibly work on mediums as diverse as the internet.
