'Blue lives matter' law used in arrest of New Orleans man who shouted slurs at police: warrant

even without such a law there are things that can be done

Angry shouting for no good reason other than to harass strangers is disorderly conduct for one.

You can be "charged" at any time for any thing is the point.

Then you get your day in court and either the charges stick or they don't.

So if you act like a fool be prepared to be inconvenienced.

Congress shall make no law respecting an establishment of religion, or prohibiting the free exercise thereof; or abridging the freedom of speech, or of the press; or the right of the people peaceably to assemble, and to petition the Government for a redress of grievances.

As the AC said, this man is being inconvenienced by his decision. The local government can enact laws, and the state, and those laws may be contrary to the rights given to citizens through the federal government. So, although the man is found guilty by local or state laws, it was a matter of time before someone broke that law in order to appeal perhaps to the supreme court where it will be established that the lower law was unjust.

Everyone should respect government and authority. But authorities shouldn't abuse their power because someone disagrees with their position.

On every question of construction, let us carry ourselves back to the time when the Constitution was adopted, recollect the spirit manifested in the debates, and instead of trying what meaning may be squeezed out of the text, or invented against it, conform to the probable one in which it was passed.

The only blue live I know are smurfs...

The rest is a criminal gang

Liberty has never come from government. Liberty has always come from the subjects of government. The history of liberty is the history of resistance.