Dangerous football matches

I want to see a football match live in Poland but I will wait for the next season. When I said the idea to watch a Polish football match I was told that I should go with Polish friends and not with foreign friends because it might be dangerous for foreigners. I was told that some people go to the matches to find a fight and foreigners would be perfect targets to release their aggression. So foreigners should keep their mouths shut and just watch. It is hard to believe that going to football match would be that dangerous. We will see next season.