Defending someone’s right to speak does not mean that you have to agree with what they say. The correct response is not censorship, but more discussion.
Physician and sociologist Nicholas Christakis argues that in politics, defending the principle of a contested election is not the same as agreeing with or endorsing a candidate. “We should defend that principle even if we don’t like the outcome of the vote.”
The best way to test your ideas and beliefs is to argue them against someone with a different stance/point-of-view.