What would you do with the answer ? They are both offensive. They are both difficult to explain to young children. I don’t really think a league table of offence helps particularly. The main point is that complaining about abusive stereotyping whilst stereotyping abusively is pretty stupid.
I’ve heard it loads of times especially at Norwich, Cardiff , Leeds. Why do you think it was sung in response to Leeds fans ? Depends what one wishes to believe I guess.