The truth is eternal, not elastic. It is what it is. Once we come to know it, our minds should be absolutely and permanently closed around it. We should be intolerant of Satan's lies and unwilling to "hear him out" or consider his point of view. We should show respect to the people who have been duped by him, and we should love them, but we ought to have no respect or love for their ideas, which are wicked and delusional. We are already accused of being closed-minded. It's time we earn the label.
The real crisis begins when Christians, confused on this point, think they need to set a good example by being open-minded and tolerant toward falsehoold just because they want their opponents to be open-minded and tolerant toward truth. They forget that right and wrong should be treated differently, and to treat wrong as if it may be right is extremely disordered.
The secular Left, on the other hand, has a famously low tolerance for opposing ideas. The Right likes to criticize this characteristic of the Left, especially among college students and millennials, but I think they're criticizing the wrong thing. Hostility to opposing beliefs isn't necessarily a vice. A lack of open-mindedness isn't always a sign of ignorance or arrogance. The problem with snowflake college students isn't they're intolerant of differing views, it's that they're intolerant of the right views.