Keep in mind while reading this you should check your privilege, as those with privilege are often blind to what they have.
Liberals grow up in a society that overwhelmingly caters to their beliefs and worldview. As a liberal, you probably never had the experience as a child (or young adult in college) where you had to write a paper espousing the "right" type of viewpoint lest you get docked a grade merely for having a conservative bent. My brother literally once had an assignment where he had to write why he was against the iraq war (this wasn't a paper for or against, you had to be against). In college it is much the same, you can never write from a conservative viewpoint, you will be docked points, guaranteed.
You have no frame of reference for growing up in a educational system that daily leaves you out in the cold. You don't know the feeling of looking across the classroom and finally finding that one other isolated conservative student. We recognize our own in our suffering.
Growing up the vast majority of teachers and the education system has a liberal bent. We are taught from birth by liberals. How many conservatives taught you growing up?
Almost all celebrities, movie actors, and musicians are liberals. Think of how media shapes our society and view of the world. All a childs potential role models espouse liberal talking points on a daily basis. How many times have you watched a movie or listened to an artists who's beliefs you've disagreed with? Or have had bands you've looked up to basically disavow fans like yourself because of your political views?
Conservatives deal with this stuff every day of their lives. That's why there is objective evidence that it is conservatives, not liberals, that are the more tolerant type of person. I can show you the polls where conservatives are far more willing to be friends with liberals than vice versa. Why is that? Why does that disparity exist in our society? Because conservatives are used to living in a liberal world. We've done so from birth and have nimbly navigated the slings and arrows. Your kind on the other hand gets your own views, your own beliefs and values poured down your throat constantly. Always reaffirmed, always coddled. When you lose, you end up shocked because you can't imagine an america that disagrees with you. That is liberal culture privilege, and you all have it in spades.