The freedom of speech protected by the Constitution is not absolute at all times and under all circumstances and there are well-defined and narrowly limited classes of speech, the prevention and punishment of which does not raise any constitutional problem, including the lewd and obscene, the profane, the libelous, and the insulting or fighting words which by their very utterance inflict injury or tend to incite an immediate breach of the peace. Chaplinsky v. New Hampshire, 315 U.S. 568, 62 S.Ct. 766, 86 L.Ed. 1031. Black's Law Dictionary, Sixth Edition, pages 627-28.
Fighting words doctrine....having direct tendency to cause acts of violence by the persons to whom, individually, remark is addressed.
If I am reading this correctly, the "fighting words" must be directed personally to the offended person. Thus, just wearing a stupid and very offensive t-shirt can not by definition constitute fighting words.
Interesting information. So, this does give us legal rights to pummel the left?