True of the first two examples, but:

> in London, a woman was led away by four uniformed officers on Monday after holding up a sign reading "Not my king" — which has become a trending hashtag — near Westminster Hall.

If you count that as rude, you're essentially counting any dissent as rude, no?

Edit: there's an even better example, of a man who was nowhere near any funerary rites, calling out "who elected him" at the proclamation of Charles' ascension.