Why do people have such a big problem with people who hold a camera?

Check this video of a guy standing on a public sidewalk holding a camera in his hands filming the surroundings.

A dozen or so people ask him what he's doing. Some of them berate him for filming people without permission. Even a Starbucks employee comes out of the establishment to tell him that he can't film without permission.

This behavior really baffles me, seriously.

The reason for this is that those exact same people don't have any problems with cameras... as long as they are affixed to walls, poles... or even cars. There are probably security cameras inside and outside that Starbucks. There's a gas station at the other side of the street, and it's very probable there's at least one camera, probably more, oriented so that the Starbucks is clearly visible. It's very likely that there are even more cameras affixed to walls nearby. Also, dash cameras are very common (especially in the United States), and are often visible behind the windshield and rear windows of cars. If a Google Maps car drives by, it will have prominent cameras pointing to all directions.

Yet none of those dozens of cameras bother anybody. Not one of the people seen in the video.

But when it's a person holding a camera in his hands, suddenly it's a problem and a concern. Suddenly he "needs permission to film" people. None of those other cameras on walls and cars "need permission", but the guy holding the camera in his hands does.

Why? What's the difference?

These people seriously seem to think that if someone holds a camera in his hands, he needs permission to film people, but if a camera is affixed to a wall, or even to a car, then no permission is required.

Astonishing.