If Ann Coulter spoke with the same level of gutter rhetoric, who would listen to her? If these speeches are supposed to be one-way affairs -- speaker delivering an address -- then what makes anyone think the audience has any right to participate? I know that in this case -- and most others -- Ann has opened the mic up to Q&A from the floor. But that is in the interest of sparking a meaningful discussion, a criterion that was notably lacking in this idiot's comments.
Reading between the lines, this guy attended the speech because he was a rich, bored punk with nothing better to do, an anger at "the system," and no moral sense to constrain it.