Is there any evidence this is actually the case? Human nature is going to be the same for these people whether their piece of paper has a 2 or a 5 on it.
As for "blocking" the gate, well, I've had to say "excuse me" once or twice but I've never been prevented from boarding a plane. This is 90% a problem invented by busybodies.
I engage with these people sometimes when they say something like, "Well, I'm in Zone 1." It's happened to me enough times to believe there are a substantial number of people who believe Zone 1 is first.