No not the innocent person filming going about his lawful business, You believe he was being arrogant i disagree he was standing up for his rights which many seem to be giving away, from your comments i assume you would be happy to do?From your comment, I am not clear who “these people” are. I kind of think you must mean the cameraman - but not sure
That cameraman was an utter arse. He was innocently filming but - as unpalatable as it is nowadays, the camera is now a tool of choice for criminals and terrorist when planning operations.
He was approached perfectly politely and just answered like an arrogant twit.
Yes they can ask him does he have to answer them no .What they have no right to do is demand his name which they believed they had the right to do then saying it was an offence if he didn't give it then follow him before they were told to leave him alone by someone with sense.
As for the camera being a tool, those from higher above better start looking at google earth where you can look at nearly anywhere in the world then . Or the folk who seem to think you can not film them in a public place but are very happy to be on cctv many times a day .
Photography is not a crime .