Complete shit rag don't get me wrong but it isn't racism ffs
Re the bit about people from liverpool racism is probably just the easiest word to tag to it.
It is prejudicial though and should come under the same thing as any other form of abuse re a specific set of people.
It's never picked up in the chants etc as it's seen as banter etc.
But in Italy you can get parts of your ground shut for chants against whoever, but northern teams have had bans for singing things like southern teams' supporters are too poor to wash etc.
But in general here, not just in football, it is seen as fair game to say something derogatory to you.