I dislike them (not hate) because of personal experiences with them and their fans. Probably one of the few on here with experience of actual scouse Liverpool fans. And yes of course it's a minority, but some of them are awful. There is also a general victim complex that goes past things like Heysel or Hillsborough and outside of football even. And then there are the ones who go that step further and think Liverpool is something different and special because it's "not like the rest of the country", they think they are not even English. As I said before, they are basically a very successful Napoli of England.
I mean, my brother in law is a Liverpool fan, like many not from there who watched the top sides of the 80s, but I don't consider him a Liverpool fan like them, they are different. Passion for the club and city is always admirable, but it often goes into the realms of rank delusion, this weird insular mentality. That's what happens when you create this kind of mythology around the club that is essentially built on nothing.
That said, I dislike Geordie Toon fans for the same reason, and that's a club who has never won anything lol.