No need to get fired up. I am not using my own understanding of the term "Bigot". This is the definition I am using from Miriam Websters Dictionary:
Bigot (n): a person who is
obstinately or intolerantly devoted to his or her own opinions and prejudices;
especially: one who regards or treats the members of a group with hatred and intolerance.
If a person is intolerant of the intolerance of others, not because of their own beliefs, but because of their interest to protect those who are victims of intolerance, they cannot accurately be labeled a bigot. That term only applies to those who base their intolerance on their own subjective beliefs and prejudices.