Agreeing with the sentiments here that you should be able to walk into any pub away and have a beer, but thats not a reality, people need to use common sense.
Me and two mates were all pretty hammered yesterday and didnt have a clue where we were going after the game, but we didnt wander into any of their back street pubs for a beer as that would have just been suicidal. We also noticed in one of the pubs beforehand that we were the only Saints fans in there, having got their early on, it just filled up with boyos. So we left and went elsewhere, just simple common sense when there is only a couple of you and a few more of them.