I've been living in a few countries that have hosted England. The vast minority are fine but there always seems to be a largish minority that are just *****.
I think it’s about 10% (although that percentage drops significantly the further you get away from the U.K. as many are too scared, poor or thick to leave Europe). They are the kind of supporter that are members of the Football Lad’s ****fest. Sadly, that’s about 1,000 knuckle draggers once you are getting over 10k England fans.
Having followed England away to World Cups, I can confirm that the other 90% are usually brilliant fans that are the pride of the England team.