We think the English fans are bad because they boo their own. Well, some Spanish (and several eastern european countries) engage in racial chants, so they're probably worse (i'd rather our fans booed us than racially abused the opponents).
But Italians take the cake (or thereabouts). They burn flags at away games and after a mixture of fan violence and corruption cost Italy Euro 2012, there's a chance they could lose the Champions League final this year if any more incidents occur this season.
It's a shame that minorities can embarrass a whole nation like this..

