There has always been hatred in football, and always will be. As far back as 100 years ago, hatred existed. Now I'm sorry, but personally, I hate Celtic, everything they stand for, and everything they do. I would happily see them wiped from the face of the earth. However, I would never dislike someone purely for being a Celtic fan, nor would I speak ill of a dead person for being a Celtic fan.
If Celtic were wiped from the earth Rangers would be nothing. And vice versa. So be happy if that happened seems a bit weird.