Once you are being ab asshole, you are open to others being an asshole back.
When you roll up on someone with a phone out and recording, you've set the tone of being an asshole.
She literally opened the conversation with a threatening move. Doubly so given the recent context of middle aged white women trying to order around black men.
It is of zero shock that he defaulted to treating her like you'd treat a cop. Short, brief answers with no detail.
If someone is forcing an illegal recording they get zero courtesy because their only reasonable intent is to screw you over.
Anyone asking you to not photograph their kid is being unreasonable?
Depends on how they do it. If it is a polite request, and they point out their kid so I can avoid them (or they get their kid out of the way if I'm taking a picture of a thing) then I'll happily oblige.
If they flat out demand that I leave the area, threaten, or try to act like a cop, I'll just tell them to go away.
Basically, work with me and I'll work with you. I don't get time often to shoot photos, so I'm not going to just give it up.
Thing is, that never happens to me. And I've taken photos of my nieces and nephews at various swim and gymnastics practices. They live on the other side of the continent. I guarantee the parents there have no idea who I am. Never gotten a second look.
I'm not black tho (but I have used the exact same style that this guy uses when dealing with cops and security guards to great effect).