A bigot is a prejudiced person who is intolerant of any opinions differing from his own.

Bigot is often used as pejorative term against a person who is obstinately devoted to their prejudices even when these prejudices are challenged, often engaging these prejudices in a rude and intolerant manner. Forms of bigotry may have a related ideology, like racism, religion, and nationalism.

Bigotry is not "intolerance," but "unreasonable intolerance". Jews are understandably intolerant of Nazi Anti-Semitism; that doesn't necessarily make them anti-Nazi bigots.

A bigot will continue to hold these opinions even when confronted with evidence that challenges such stereotypes. To protect his views, he may either dismiss the challenges he encounters as an aberration to the norm and ignore the fact that they threaten to undercut his prejudices. On a more extreme level, he may deny the evidence altogether. Both reactions can be classified as forms of cognitive dissonance.

See also: zealot, partisan, hate group