A group of George Washington University students silently walked out of a speech given by Israeli ambassador Michael Oren. Oren asked them to stay and participate in a dialogue, but they refused, instead protesting outside.
And you know what? Fine by me. This isn't UC-Irvine, where students yelled and attempted to overtly prevent Oren from speaking. They stood up and made a point in a manner that did not materially affect Oren's ability to present.
Do I prefer dialogue to this sort of action? Sure, I guess. But people have a right to protest in ways other than my own preferences. So long as they aren't being disruptive or interfering with the ability of others to present their views, I have no grounds to complain.