Refuse to hear

Someone speaks and others walk out at a UN meeting. And yes they had gathered to discuss. Who is more at fault? The speaker or the listeners? I am surprised that in this time and age people are so sensitive to ideas or viewpoints different from theirs. And walking out on a speaker does not reflect too well on the audience. I wonder what happens when speakers walk out? A speaker walks in and looking at the audience decides "Nah, I dont want to speak to you!" That will be some meeting.