From my own experience as a centrist, and from speaking with other people who are reality based in their views, I can see why many of us tend to be intolerant of right wing views. (Please note that as a reality-based person, our views are considered by the media and by other right-wingers as nutty moonbat leftist blah blah blah.)
The reason is that the right has gone so far off any outside edge of reality and sanity that their arguments are all truly incoherent garbage. When your group claims that white people are superior to nonwhites: that global warming is a hoax: that evolution is a farce: that science is (and scientists are) inherently unethical: that working toward renewable energy sources is a fool's errand; that the US is meant to be a Christian nation: coorporations are people: god hates homosexuals: women should be subservient to men: trickle-down economics will work: etc....etc....etc... And your group clings to these lies, tighter and tighter as you are handed more and more evidence that you are indisputably wrong.....
....then yes.....
Even the most calm and rational "lefty" will eventually give up hope of trying to help you out of the cesspool you've not only chosen to live in, but also that you are trying to drag the rest of us into.
So
@Nowhere Man , your OP is wrong, in that it is misleading. Liberals, IMO are not intolerent of the
opinions of other people. When a subject is open to opinions, then liberals, like anyone else, are open to discuss those opinions. But when little Jimmy Rightwinger wants to argue with his math teacher that 2+2 does in fact equal 23, and that he cannot be told he's wrong, because its his
opinion, and
opinions are never "wrong". Well then Jimmy Rightwinger gets a pointy hat, and a trip to the principal's office. And no, he shouldn't be allowed to use the school intercom to teach his version of math to the other students.