That's absolutely right, you can not stop me booing, and you shall not.
The club hasn't requested we stop booing as far as I'm aware? Guardiola has said he doesn't understand the booing and wishes there was a positive atmosphere.
But even if the club requests we stop booing, so what? It's part of a democracy that you are allowed to voice discontent, as long as it is not inciting prejudice or race hate.
Booing the UEFA anthem doesn't fit in to that category so fans are perfectly entitled to boo, and no, it isn't any of your business.
You can have a moan and voice your discontent, that is your right. But if people want to continue to boo there's absolutely nothing your moaning is going to do to stop it.