I agree that there are certain lines of thoughts that shouldn't be tolerated. Like if someone thinks it's ok to rape or kill or enslave people, for example. Obviously. But you will literally hardly ever find that in Western culture. Usually intolerance of thought is directed at someone who has a different religion or a different political opinion than yourself.
"Of course, everyone will claim they respect someone who tries to speak the truth, but in reality, this is a rare quality. Most respect those who speak truths they agree with, and their respect for the speaking only extends as far as their realm of personal agreement. It is less common, almost to the point of becoming a saintly virtue, that someone truly respects and loves the truth seeker, even when their conclusions differ wildly."
-walsh
-walsh