I had no problem with the brothers ribbing each other when their respective teams scored. But Harry's display during the Welsh anthem wasn't ribbing. It was petulant and disrespectful. Especially, since a minute earlier he had robustly sung the English anthem. Welsh people on Twitter were reminding him that his father is The Prince of Wales, that his grandmother is Queen of Wales, and that his name is Prince Harry of Wales.
The point I was trying to make, is that if William wanted to throw all decorum and diplomacy out the window against Fiji, they wouldn't be in the position to take to Twitter and complain because they no longer have the Queen as their head of state.
If William attends the Wales-Australia match he won't have an opportunity to misbehave, so if he has any bratty whims he better do it against Fiji.
All I'm trying to say is that the royals represent more than just England. So far so good, from William in this tournament. He needs to keep it up with all the Queen's countries.