In which instance would one’s constitutional right to freedom of speech NOT be protected by law? protesting the government by desecrating the flag printing a pamphlet calling for the removal of the president threatening the personal safety of a political opponent in a debate refusing to say the Pledge of Allegiance because of its reference to “God”
"threatening the personal safety of a political opponent in a debate" falls under the category of verbal threats, and is illegal in the United States, regardless of whether or not its made in a humorous manner or not.