The only legitimate complaint is that he is there as the head of state of the second most important commonwealth country for the Queen's funeral. The country is in a national period of mourning. Supermarket chains (Morrisons) turned down the volume of beeps and their music and announcement out of respect for the Queen.
This just comes across as disrespectful. I think had he not been there for a funeral, the response would be different.
It's fair to criticize the behaviour without thinking that's in an egregious sin worth of removal.
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