I've noticed this same "its-all-about-me" attitude. It can occur anywhere, like on the sidewalk, in the grocery isle at the supermarket. Essentially you're "invisible" unless you're a part of their little "scene". Sometimes what you can do is, stop dead and just watch how long before you become "visible". Sometimes I turn to someone close behind me in the supermarket and ask; "are you going to ram my legs with your trolley?" Usually that snaps them out of their dream and when they see you they say "oh no, I'm sorry, I won't ram you" and then we part amicably.

The really interesting thing to ponder is:- [1] How do people get like this?, [2] am I, or was I, ever like this? I would reason that if you continually pamper someone and yield to their desires, especially during formative years, the part of the brain that deals with surroundings will die or become atrophied. This is quite a risky problem, e.g. you might wander across a level crossing and get mowed down. So anyone raising children may be doing them a disservice if they yield too much. I've noticed that fat people and people in suits seem often to have this - let's call it "the me oblivion". This generalization about fatties and suits may be less discernible in the US because physical display is less of a guide as to one's capability to assert one's self; due to the fact it is legal to have a concealed form of "assertive capability", hehe ;-).