A telephoto lens is a quick and easy path to crappy street photos.
And the truth is you would not hit someone back if they did that. Very very few people would. If you go out with a camera and shoot on a busy street like that, most of the people there won't notice you, or pay any attention to you. I'm not a huge fan of Gliden's work though, because by intruding into the person's space, he is changing the scene, no longer "telling the truth" in the same sense. But he's not trying to do that, he's creating images that express what he feels and thinks.
Here's a random example-- not my favorite shot but a good example of just how close you can get.
I don't get to shoot in the city much, so when I do I usually find I need a day or two to "warm up"-- one way I do that is by limiting myself to shorter lenses so that I don't get lazy and zoom. Often I'll have all pretty middling stuff then one afternoon the light will hit just right and people will be out and everything will click.