A bigot is one who holds unjustifiable prejudices against groups of people, without knowing them personally.
Common targets of bigotry are people of particular races, genders, or sexual orientations.
Bigotry in its various shades is often exploited by politicians, as in Richard Nixon's "Southern Strategy", and Karl Rove's strategic approach to forming a "permanent Republican majority".
 Historical usage
Interestingly, in the past, bigot meant a religious hypocrite, especially a woman. 
Prior to the Allied assault on the beaches of Normandy in WWII, "bigot" was a "classification higher than Top Secret that was used for all Overlord material." The individuals who had been briefed on the details of the operation were said to have been "bigoted."
 See also
- ↑ Online Etymology Dictionary
- ↑ when King George visited a command ship and asked what was beyond a curtained compartment, he was politely turned away because, as a sentinel officer later said, "Nobody told me he was a Bigot."