Universities should be citadels of open debate, even when the views expressed make people uncomfortable. Get over it. Respond with a better argument. Make your own sign. Hold your own meeting. Great universities are built on free speech, free inquiry and spirited debate. So are great countries.
—Charles Lipson. Alas, the piece is behind a paywall, but if you can get through to read it, be sure to take the time to do so.