Over the weekend, I very nearly un-Friended a church member on Facebook.
This woman is a pillar of the congregation, exceptionally gifted, and holds several important offices. But she frequents certain web sites that spew forth racial hatred, and she Likes certain items, and they show up in my Timeline. I will never voluntarily expose myself to such material. (Related: Change your diet.) There can be no dialogue with it: even to take it seriously is poisonous to my soul.
One can choose, however, what one pays attention to.
Milo Yiannopoulos is a troll.
There may be no lawful way to silence them, but those persons and organizations (such as Young Republicans) who sponsor them, hire them, and give them gratuitous platforms, may be persuaded that the nation deserves better.