Coulter gets invited on TV shows when she has a book to flog: she can be relied upon to say outrageous things, egged on by her hosts.
She also asked Behar if, given the fact that Oprah Winfrey has an audience at least as big if not larger, would Behar say that a big chunk of Oprah's audience hates Oprah? Whatever you think of Coulter, this just makes pop-cultural sense.