I must say I have observed this 'phenomenon' in days gone by, wearing Scotland colours in Spain, in France, in England and in Glasgow. There is a huge element of antagonism attached to these extreme factions of 'fuelled up' England fans. There are some good books published down the years that cover this very topic and it's a multi-layered problem - lotsa issues attached to it! I'm assuming that general bad behaviour remains the same, based on televised footage of the events over the past 3 days.