human beings are just intolerant of things that they are not used to seeing.
its a biological primal mechanism of seeing something unknown as a threat.
your environment and social conditioning can influence how strong this mechanism is. If you were raised with a lot of fear, insularity, bigotry, closed-off towards the world, dogmatic tradition, tribalism, you are more likely to be intolerant of many things that you are not used to and the fear based primal mechanism gets more activated when you see things that you don't know.
yet if you were raised in an environment with more nurture, openness, less fear mongering, less insularity and tribalism the negative feelings of intolerance is usually less of a trigger when you see things that you are not used to seeing
probably inherited from our primitive ancestors.
btw, intolerance is something that all humans have regardless of culture, ethnicity, gender etc.
the way it gets triggered and manifested depends heavily on brain mechanisms and how one was raised through certain environments
the reason why so many evangelicals, orthodox religious extremists, and fundamentalists sects are the way they are is because their beliefs and uprbringing taught them to be closed-minded and fearful of the world
that includes evangelical and fundamentalist christians, islamic radical fundamental extremists, extreme orthodox jewish communities, fascism, extreme nationalists, totalitarian authoritarianism