There is nothing intellectual about this person, for that reason arguing with him intellectually will get you nowhere. Even with intelligent, intellectual people, topics that are highly charged with emotion cannot be handled intellectually. The simple fact is that the most effective way to convince most people is to have them become personally connected with one of the people they are prejudiced against. Slowly they change from, "people who are X are perverted," to, "people who are X are perverted, but not you," to, "some people who are X are perverted," to, "people who are X are just ordinary people." There is no shortcut to this process.