you are in the UK...
Here's the applicable parts of Freedom of Speech for your country:
http://en.wikipedia.org/wiki/Freedom...United_Kingdom
I want to add one more thing... As European, I am also a very passionate Football fan. But I also happen to be a passionate opponent of everything related to Ultras and the kind of consorts who are counterproductive, and are more interested in violence in and around the stadiums (keyword 3rd half). Those people need to be banned from the stadiums and let the true fans enjoy their games and support their teams.
Rivalry against the other teams fans is perfectly fine. Fighting them used to be done by singing them into the ground. Outperforming them in my own fan curve.
Chanting down on the other teams players is one thing. No problem boo'ing and what not.. But personal insult outside the stadium is crossing a line.
And more than often it's also hypocrisy at it's purest form.
Artificial hate against players, while they wearing their clubs jersey.. The moment they put on the national jersey those who hated them so much, become passionate fans.... Bullshit.. outright bullshit...
Violence in Football got out of line.. Started decades ago.. The UK could sing a song about it..... How was it when the entire UK was banned from all UEFA events?
Thanks to Hools and the lack of proper law enforcement... Those days are over, law enforcement works today. I admit, sometimes it's too much enforcement. But it only boils down to a bunch of idiots ruining it for everyone else. If you got a problem with that, and you are somewhat sane, then go after those idiots who act so far beyond everything tolerable that the freedom given from the law gets cut down, and the law as it existed for the longest time gets enforced.