First I've heard of it.
I must miss all the anti Southampton songs when I'm at the game.
Ah, the reasonable fan..!
OK, what Jen was saying was the traditional rivalry between teams, not actual hatred.
I'm probably the worst person on the planet to make a stab at why rival fans don't like or hate ManU, because basically, clubs apart from Southampton FC don't even register on my radar. ManU, like others, may have a tremendous history, but as far as I am concerned, they exist merely to play Saints one day. That's how uninterested I am in other clubs. So I don't dislike ManU, because I can't summon up enough energy to do so. Unfortunately, I'm constantly reminded of the existence of ManU [and other clubs] by a clamouring media, and the fact that I actually have to make an effort to shut it out occasionally annoys the hell out of me. Everywhere I turn, there is ManU [and others, of course], when all I want to see or hear about is my club.
But please don't consider yourself picked on. I have the same problem with any club that gets more than its fair share of exposure, be they Arsenal, Chelsea, etc... Hopefully, I have made my point clear. As I said, I'm probably not the best person to make an appraisal on the subject.