Last night, NYU president John Sexton was a guest on the Colbert Report on Comedy Central. Before each taping, Stephen Colbert warns his audience that he plays a character and that character is an asshole. Unfortunately, as was revealed on the show, Sexton does not play a character. Instead, he always talks too much, thinks he knows everything, and can't take a joke. I mean, come on, you don't go on someone else's show and make fun of the host, and you don't argue with a straw man. In addition, Sexton used the occasion to promote his new casebook rather than to promote NYU--and the ultimate job of all university presidents is to promote and fund raise for their institutions.