He thinks that whovians belong in the same catergory of people as white supremacists. That he is an educated person means that he KNOWS how that paragraph will be read.
I hate that kind of thing. I think it is awful. I look back in my life and think of all the great friendships and conversations I've had with people who hold diametrically or at least very fundamentally different views to mine: Communists, atheists, Muslims, Mormons, Jehovah's Witnesses, born-again-Christians, Northern Irish republicans, Scottish Nationalists, UKIP voters, Manchester United supporters, Black Supremacists, White Supremacists, gun nuts, Daily Mail readers, Guardian readers, radical feminists, Australians, even fans of Doctor Who. In the abstract I might have thought, or still think, that the views of those people are wrong - in many cases even odious, dangerous and appalling. But almost invariably, when opinions are filtered through the good humour, self-deprecation, negotiation and common sense of face-to-face conversation, they are revealed to be absolutely no reason for anybody not to enjoy another person's company.