Bigotry is an irrational or unfounded prejudice against viewpoints that contradict one's own, especially with regard to religion, politics or ethnicity.
 Bigotry vs. prejudice
The connotations of bigotry tends to be stronger (and uglier) than mere prejudice, since it usually involves behaviour resulting from such prejudices. Simply disliking some group or belief in and of itself is a free, private point of view, and even though it may be crippling to clear thought, is an inalienable right. When a prejudice crosses over into actions, it denies the rights of others to participate in a free society.
 See also