First, can I make clear that I do not personally hate any team, including Liverpool. However, there are some I resent and some for whom I have a deep dislike, for a variety of reasons.
But I don't dislike Spurs, Aston Villa or Newcastle and a number of others because they aren't and never will be a threat to United.
Nobody is able to say with certainty what started the intense inter-club hatred. It may stem from history centuries ago; it may have been stoked by Liverpool's success in the 1970s and 1980s; and inflamed by Liverpool supporters' inability to cope with their lack of success since then.
It isn't helped by the behaviour of some elements of each set of fans, although it may have become less intense for some United fans since their "noisy neighbours" became a credible force in football.
Sir Alex has always referred to Liverpool vs. Manchester United matches as the biggest of the season. In their context, that is unlikely to change.
Everyone will have their own views about "Why United Fans Hate Liverpool" and the specific things they hate. This article puts forward 10 possibilities. Please add your own opinions in the comments.