In the eyes of many/most liberals, to disagree IS to hate. It is inconceivable to them that anyone could disagree with their strongly-held beliefs (and sadly, I do think that they really believe what they say) unless they were filled with hate.
Of course, that is wrong. And I don't hate liberals. I strongly disagree with them, and I think that they have been misled (I speak here of the rank and file liberals. The liberal leadership knows what it is doing and uses the weaker liberals to get what they want politically, which has NOTHING to do with the liberal philosophy.)