A few things.
The whole 'its coming home' was always an ironic song. Until last night though it got pretty serious and rightfully so. We are pretty good in all honesty. If that song did/does actually ruffle your feathers, then you are missing the joke.
To be fair, a lot of people might have not heard the rest of the song, especially anyone who is not from England so all they're hearing is "It's coming home, it's coming home, it's coming, football's coming home". In isolation, that sounds pretty arrogant and cocky so you can't really blame people for "missing the joke". Even most people from England probably dont remember the rest of the lyrics.
Doesn't help that certain pundits got overly carried away.
Rio saying during the Italy Spain game that nothing he sees out there will threaten England (despite that probably being one of the highest levels of football played at the tournament). He was banging on about how none of these players would get into the England team (um... the Italy keeper would like to say hello?).
When the dive/soft penalty was given against Denmark, I remember some pundits (Alan Shearer) were saying it was soft and others (Jenas) saying it was stonewall. Then you had idiots like Dixon who when asked if it was a pen or dive, he responds "I don't care" but constantly complaining when other player dive. The double standards from morons like him were annoying.
Gary Neville also constantly up Southgate's arse, like a blind follower, refusing to criticise anything about him, as if he's the next SAF or Pep