They aren’t being arrested for being anti-monarchy though. They are being arrested for being rude about it. Was the fella on radio 4 who stated to the entire nation that ‘King Charles and his family should be put in a council house and that the Monarchy should be abolished’ arrested? No. If you are going to attend a funeral, any funeral, be it the Queen’s or anyone else’s and hurl abuse or hold up signs with obscenit…
The queen was a public figure whose lavish livelihood were paid for by British tax-payers. So it seems to me that British people should have the right to celebrate her death in any way they please. Curtailing people's freedom of speech by misusing public order laws (the queen's funeral is not comparable to any normal funeral) is curtailing freedom of speech.
Am I allowed to be rude to a cashier because I pay them?
Do you not see what (non-monetary) price public figures pay for their role?