One who holds a creed or opinion in an obstinate narrow-minded way, and is innaccessible to all reason in respect of it

One sign of a bigot is an inability to recognize when the cap fits, so they can wear it.

Actually I've never come across "bigot" used as a specifically male-directed term. Bigots come in all sexes, colours and political and other orientations. The most uncomfortable are the ones who are lined up on your own side in a dispute, but make you wish they were on the other side.