I don't just think a monarch deserves respect, I believe all humans do. While we cannot change the past, we can work together to make a better future.
Respectful, mature communication doesn't include shouting and waving arms in an angry way.
Whatever you think of the Monarchy, I don't think shouting angrily and aggressively in public is the right way to behave to anyone, whoever they are. If they have cancer, it's even worse. It always pays to Be KIND
Even if King Charles was responsible for the genocide, there would still be better ways of tackling the situation. I agree that she demeaned herself.