I saw that video earlier. It's an interesting one because, let's face it, there is a chance that he's just choosing not to wear a mask and being a bit of a belligerent arse about it. Certainly twitter seems to think that's the case because he's young, white, gobby and male therefore obvs let's all assume the worst.
But in a kinder more accepting society maybe, just maybe, he's ex armed forces suffering from PTSD, maybe he's spent his early life in the care system and was abused, maybe he's a rape victime, maybe he's undiagnosed ASD. The point is, we don't know and neither does that police officer. And no one should have to verbalise out loud, in front of strangers, those reasons.
There's no way the police would treat me like that as a 49 year old woman and yet the police think they can do that to him because they've made assumptions. If you're told someone has an exemption you accept their word, and accept that the odd chancer slips through the net. Because the alternative is that you bully and oppress the vulnerable.