England needs its own national anthem I suggest a rejigged 3 Lions, but after they win something, so it could be a long time away!
All countries boo, especially those with long historic conflict both on and off the field.
But when it's England some people will pounce on it to imply that, some how, their nation is better, and manage to ignore that their fans do it too. I suppose it is infrequent for some nations to boo at major tournaments, due to the cunning plan of rarely qualifying.
Never mind, I am sure they will be rejoicing soon enough when England go out, you have to take your pleasures where you can.
We won't even mind, it's water off a ducks back, for WE ARE ENGLAND!
Put that in your pipe and smoke it.