"The right of others to free expression is part of my own. If someone’s voice is silenced, then I am deprived of the right to hear. Moreover, I have never met nor heard of anybody I would trust with the job of deciding in advance what it might be permissible for me or anyone else to say or read. That freedom of expression consists of being able to tell people what they may not wish to hear, and that it must extend, above all, to those who think differently is, to me, self-evident."
See clip from 2006 University of Toronto debate (“Freedom of Speech includes the Freedom to Hate”)