Personally I enjoy singing the national anthem, find Scousers insufferable when it comes to football, and think booing Abide With Me is disgusting, especially when it's being sung by people whose families are affected by an awful, underpublicised disease like sickle cell.
However, I am very wary of any outrage campaign led by the likes of the DM. When people were booing players for taking the knee, they had no problem with it, and we have a a PM who wouldn't condemn it for days. Considering what black players and fans have been through through the years, and still go through - including our black players and fans - that was pretty disgusting. Basically these are people who say they want freedom of speech, but what they really want is freedom of speech entirely on their terms, ie the freedom to be nasty to minorities and not the powerful.
Don't get me wrong. Not in favour of booing anthem, hymns, or the President of the FA. There are far better ways to express discontent. But I suspect there's more to this tabloid 'outrage'. There's a section of the press which just does not like anyone who won't pretend all is rosy in the garden, and they like it even less when you're from a big Northern city where they don't have much control over opinion.