Baloney. Tolerating evil makes one just as guilty as the doer of evil. The ideologues like to chime in that evil is so awful and terrible that the only worse thing is the societal discouragement of evil.
The point of the article is that libertarians defend intolerance, at the private level.
Be as intolerant as you like. I don't mind. Kick people out of the Scouts, don't rent to them, don't hire them, don't sell to them. We defend your absolute right to do so.
You don't need government to practice intolerance. When personal intolerance is practiced through government force against people who haven't initiated force or fraud, the result isn't merely intolerance. It's oppression.
Given the subject of the post, I assume you are referring to homosexuality. Since you say we cannot tolerate evil, what do you propose be done? Jail all homosexuals? Shoot them?
Are you saying that a person's morality is meaningless unless he backs it up with government force?