this is an obviously disingenuous argument. bigot refers to prejudice. a person can be a pro-choice extremist, but not a pro-choice bigot. the phrase simply has no meaning.

Or how about a pro affirmative-action person in deeply conservative areas? Plenty of people would say that it's a bigoted view. Not to mention, affirmative action is explicitly treating people better or worse based on their race, sex, or other aspect of their identity which is the literal definition of prejudice. [1] Some may say that careful application of prejudice is acceptable to account for past injustices (and I do, for example), but that does not change the fact that it is an example of prejudice.

Again, the fact that the majority of people would call a given viewpoint bigoted is just as much a statement about the environment that calls the view bigoted as it is about the view itself. Plenty of mainstream liberal views would be considered bigoted in other developed democracies (e.g. a lot of European countries don't practice affirmative action). Conversely, plenty of mainstream conservative views would be considered bigoted by liberals (I'm going to go out on a limb and guess that I don't need to give an example).

[1] "Prejudice is an affective feeling towards a person or group member based solely on their group membership. The word is often used to refer to preconceived, usually unfavorable, feelings towards people or a person because of their sex, gender, beliefs, values, social class, age, disability, religion, sexuality, race/ethnicity, language, nationality, beauty, occupation, education, criminality, sport team affiliation or other personal characteristics. In this case, it refers to a positive or negative evaluation of another person based on their perceived group membership" https://en.wikipedia.org/wiki/Prejudice

I believe it's the definition of discrimination, not prejudice, that you're looking for.