You know there is a difference between people choosing to spend their own money watching football, and taxpayers paying tens of millions for the coronation. That money could help the real issues that you refer to.
I'm not as much of an anti-monarchist as some on here, but it's hard not to be swayed by things like this, and, for example, how much land the royals own (when in the last 7 years we've heard a lot about how the UK is a small island with not much space for its increasing population).
When the other side of the argument is "yeah but we like football and they're rich so what you gonna do
", it's pretty weak.