I mean, people use dash-cams protect themselves in case of a car crash, so do you think people in the future would also use body-cams protect themselves in case of being involved in a fight?
In the USA, in a public space, Member B doesn’t have a legal leg to stand on. You have no right to privacy in a public space.
This wasn’t in America, it was a private group. Also both peoples had had their views respected, at different times. It was the collision of rights that caused fun.
Privacy advocates are quite common in hackspaces. They generally have their requests respected. The rule of thumb is to check before taking pictures of someone else, or their projects. Most don’t have an issue, but a few might want to limit some things.