Webster's Dictionary, which (arguably perhaps) at one time set the standard for American English usage and spelling would agree with what you call the "original" meaning of the word. In common usage in the States, however, bearded bruce and Nerd have come much closer to "bigot's" usual 21st century intent than has Webster.
You might at any time easily substitute "prejudiced bastard" for bigot in my portion of the United States, except of course in polite company, and not have missed a beat.