There are a lot of things you shouldn't do but you can. I don't understand your point. Wearing a bandana over your face at a bitcoin conference doesn't change a thing. Anyone is allowed to take a photo of you. You might think it is a dick move. It might ruffle some feathers. But that is all well within their rights.
Discussion
People get undressed at the beach and it's implied that they don't want their photo taken while they are in a bikini. People wearing a bandana are expressing that they don't want their identity revealed.
Taking photos of people on bikinis at the beach is a dick move, taking photos of people wearing a bandana is a greater dick move. It's basic courtesy.
Wrong.
People going out in public trying to cover their identity are doing the exact opposite of common decency.
It defies the social order of Western culture and it is highly ignorant. You can't board a plane or enter a bank with your face covered. There is a reason for this.
When you go out in public. You are in public. Period. And you actually can take pictures of people on the beach. I don't know what the fuck you are talking about. Have you ever even been to a beach or been in public?
If you go out into the big scary world...people will take your picture. It is within their legal rights. Sorry I don't make the rules. It is proof of work pal.