Interesting comments in this thread
Those in the military, and ex servicemen, are generally deemed in high regard, with a reasonable take on life and reality(though I would certainly question that given my experiences). When those people are serving, after having sworn allegiance to the monarchy when the sign on, they are expected to salute or apply the appropriate etiquette. And just like saluting officers who you may consider useless/wankers/or whatever, you are acknowledging their post, not the person. So until the constitution changes, he is our King whether you like it or not. And he is as much the monarch, as was the Queen.
And irrespective of the argument of tourism benefits from visitors to Buck Palace or wherever, we as a nation have been moulded by, and benefitted from, people fighting for, or supporting, the monarchy. Yes, it may have been because they were poor and had no choice, but we rampaged around the world under, and extolling the virtues of, the monarch.
I find it strange that people feel they can just disown it all, and claim they are not part of it. Protest as much as you like, but just like the Brexiteers who were in Europe until the vote was passed to come out of it, it is what it is.
Maybe start a Republican Party on a single policy campaign, and then things could change