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. -- First Amendment
The most basic component of freedom of expression is the right of freedom of speech. The right to freedom of speech allows individuals to express themselves without interference or constraint by the government. The Supreme Court has also recognized that the government may prohibit some speech that may cause a breach of the peace or cause violence. Words which would likely make the person whom they are addressed commit an act of violence which obviously does not apply in this instance. Fighting words are a category of speech that is unprotected by the First Amendment: Cf. Chaplinsky v New Hampshire, 315 U.S. 568 (1942). In this instance, people are so festive at this Alaskan State Fair that people are having their picture taken with the individual. The only coercion is first by the security guards and then the police. The speaker did nothing wrong by expressing his opinion.
Cf. Free Speech Movement: http://en.wikipedia.org/wiki/Free_Speech_Movement