With how much the English have worked to remove the "hooligan" tag from their football supporters, that doesn't surprise me in the least. I would agree that in this day and age the movie is definitely exaggerated. While I'm sure isolated incidents of this type of thing still happens in England, it's nothing like heyday of the 80's.
If anyone is looking for a real insight into the old underbelly of the English "hooligan" culture, I highly recommend the book "Among the Thugs" by Bill Buford.