It seldom occurs to them that intolerance comes in all political shapes and sizes.
A protester storming a stage and refusing to let someone speak is intolerant. So, too, are campus speech codes that restrict freedom of expression. A city official threatening to fine a pastor for declining to marry a gay couple is every bit as intolerant as a right-winger wanting to punish gays with sodomy laws.
There is a word that describes this mentality. It is “illiberal.” For centuries, we have associated the word “liberal” with open-mindedness. Liberals were people who were supposed to be tolerant and fair and who wanted to give all sides a hearing. They cared about everyone, not just their own kind.