I'm not sure that's a great example. In the US, legally, you're probably right. As a matter of good manners, if a vendor at a crafts fair in a public space puts up a "No photos please" sign, I'm going to respect their wishes. They're paying for a stall to sell things, not to be a photo subject.
If I'm shooting pics on a street or a park and someone makes it clear they don't want their picture taken, I'm not going to insist on my legal rights. (BTW, this is a different case from officials saying I can't take pictures of some public space because security or whatever--although I mostly won't care enough to try to make a point.)
Just because something's legal, doesn't mean you have to insist on doing it against someone's wishes.
This is why I was looking for opinion data as I feel quite differently in that a “please no photos” is an unreasonable request.
I’m not going out of my way to bother the person, but if I need a photo, then I will take it. I don’t think that’s part of general politeness. And being publicly visible is part of buying a stall (free in this venue).
Again, I think of this in the viewpoint of how I archive my life. Should I turn off my recording to please everyone’s various wishes, if they are unreasonable.
However, I feel differently in someone’s home or a public business where their requests may not have legal binding, but I’d certainly comply.
If I'm shooting pics on a street or a park and someone makes it clear they don't want their picture taken, I'm not going to insist on my legal rights. (BTW, this is a different case from officials saying I can't take pictures of some public space because security or whatever--although I mostly won't care enough to try to make a point.)
Just because something's legal, doesn't mean you have to insist on doing it against someone's wishes.